Underbrush vs Larineco 2026: the honest difference

The quick verdict, criterion by criterion

Here is who does better on each thing we could check, with the single fact that decided it. All of it comes from our brand database, our Underbrush review, our Larineco review and our citation audit, re-read on 4 September 2026, with the Larineco facts and the Underbrush prices, guarantee and whitening claim re-checked on 4 October 2026. Where neither brand publishes something, the line says so instead of guessing.

• Ingredient list: tie. Both publish a full list, though Larineco's product page shows two versions that differ. Neither publishes a quantity for any ingredient.
• Dose per piece: neither. Our database records "not disclosed" for both.
• Particle size: neither. Underbrush says "nano and micro"; Larineco says "nano." No nanometer figure from either.
• Documents you can download: neither. Zero for both in our database.
• Evidence cited: Underbrush, with a caveat. It cites about 39 studies and 3 of the 8 we checked resolved cleanly. Larineco's product page cites none, and the sources on its other pages are toothpaste or ingredient studies, none on this gum.
• Accuracy of what is cited: neither passes. Five of Underbrush's eight spot-checked citations did not open to the record claimed. Larineco's product page has nothing to check.
• Guarantee that matches the policy: Larineco, narrowly. Both product pages promise more than the policies behind them. Larineco's policy still refunds a first purchase within 30 days; Underbrush's makes gum final sale unless you paid for an add-on.
• Third-party review record: Underbrush. A 2.7 out of 5 on Trustpilot from 14 reviews is not good, but Larineco's BBB profile shows an F rating and 195 complaints.
• Company paperwork: Underbrush. A Wyoming LLC with a registered USPTO trademark and one consistent founding story. Larineco is a named New Jersey corporation with three different addresses across its own documents, and BBB lists it as a sole proprietorship.
• Price per piece: Underbrush. Both can now be computed: Underbrush's box prints 18 pieces and Larineco prints its own per-piece figure. Bought once, Underbrush works out to USD 0.83 a piece and Larineco to USD 1.11; at the repeat subscription price, USD 0.67 against USD 0.83.

If you only want the one-sentence version: Underbrush is the more documented company with the less careful citations; Larineco is the more disclosed ingredient list with the heavier complaint record; and neither tells you how much hydroxyapatite you are chewing.

Underbrush and Larineco, side by side

"As labelled" means what the brand's own page says, not what we assume is inside. Every cell carries the date we looked or points to the page that does. Where a brand publishes nothing, the cell says "not stated." We do not fill blanks.

Data: minvelle.com brand database and the linked review and audit pages, re-read 4 September 2026; Larineco rows and the Underbrush price, pieces and guarantee rows re-checked 4 October 2026. Prices are the brands' own list prices on the date of our review and will drift.

How we checked, and what we did not do

This is not a taste test. My opinion of how a gum feels in the mouth would be worth exactly as much as one Reddit comment, which is why the texture section below quotes Reddit rather than me. It is also not a lab test. We did not send either gum to a laboratory to measure hydroxyapatite, and any page that tells you it did should show you the certificate.

What we did is read. Each brand has a full review on this blog, written on its own and dated: the Underbrush review and the Larineco review. Underbrush also has a company page, on Nathan & Sons, and a page on what Reddit says about it. For each review we captured the product page, the ingredient list, the FAQ, the refund policy and the terms of service on the same date, so that when a storefront and a policy disagree, we can say they disagreed on that day rather than guess that one was updated later.

The evidence check is the citation audit, run on 27 August 2026. It asks two questions of every reference a brand publishes: does the PubMed ID or DOI open at all, and does the record it opens match the authors, journal, year and finding the brand attached to it. A citation that opens to the wrong paper gets recorded as "wrong record" or "wrong authors." A brand that publishes no citations gets recorded as "cites no studies," which is a different finding and we keep the two apart. For this page I re-ran the seven PubMed IDs that appear below through NCBI's own lookup on 4 September 2026 and confirmed each title and first author.

The third-party record comes from where each brand has one. Underbrush has a Trustpilot page and no BBB profile. Larineco has a BBB profile, a ScamPulse listing and a Trustpilot page, which showed 2.8 out of 5 from 746 reviews on 4 October 2026, on a profile the company has claimed. We report what each platform lists, with the date, and we do not add the two records together as if they were the same measure.

What we refused to do: estimate a dose from the order of an ingredient list. The per-piece prices on this page rest on counts the brands print themselves: "18 PIECES" on the Underbrush box, and Larineco's "18 pieces of gum per box" and "$0.55/piece on first order". Brands change pages. If either brand publishes a dose, a size or a corrected citation after 4 October 2026, this page is out of date on that point, and I want to hear about it.

If Halo is the other gum on your list, Halo vs Underbrush gum runs the same comparison on ingredients, dose and price.

The ingredient labels, line by line

This is the section where the two gums look most alike, and the resemblance is real. Both are built on a natural tree-resin base rather than the synthetic polymer base of a supermarket gum. Both sweeten with xylitol and erythritol. Both add calcium bentonite clay. Both name hydroxyapatite as the mineral active. The differences are in the details, and in one case in what one brand chose to add that the other did not.

Underbrush, as listed

The mint-flavor list quoted on our Nathan & Sons page runs: xylitol, chicle base (chicle, candelilla wax, citric acid), erythritol, mastic gum, spruce gum, acacia gum, mint flavor, myrrh gum, hydroxyapatite (nano and micro), calcium carbonate, calcium bentonite clay, magnesium carbonate, zinc gluconate, terpene blend. Fourteen entries, no quantity for any of them.

Three things stand out. First, xylitol leads the list, ahead of the gum base, which in a descending-order label means it is the largest single ingredient by weight. Second, hydroxyapatite sits ninth, after the mint flavor. On a descending-order label that places it below the flavor by weight, and the page gives no number to say by how much. Third, the phrase "nano and micro" tells you the mineral comes in two size ranges without saying what either range is. Our Underbrush review records the particle size as not stated, and our database records the dose as not disclosed. The list also carries three extra minerals, calcium carbonate, magnesium carbonate and zinc gluconate, that Larineco's list does not.

One detail that our Nathan & Sons review found worth noting: the company's own blog comparison article names a competitor, Enamio, as the "best fit" for "concentration transparency." That is a brand grading itself second on a criterion it does not itself publish a number for. I read it as candor rather than as a problem, but it does confirm from the company's own keyboard that the concentration is not on its page.

Larineco, as listed

Larineco's product page carries two lists, as checked 4 October 2026. The "What's Inside?" tab names nano-hydroxyapatite, xylitol, erythritol, "Chicle gum, mastic gum, spruce gum, myrrh gum, acacia gum", natural calcium bentonite clay, eggshell powder and a "Terpene blend (menthone, carvone, cineole)". The label image, and a second section on the same page, read: "Nano-hydroxyapatite, Xylitol, Erythritol, Chicle gum base, Mastic gum, Myrrh gum, Acacia, Calcium bentonite clay, Calcium carbonate", with "Natural flavors" added in the section. The label version drops spruce and the named terpenes and lists calcium carbonate where the tab lists eggshell powder. We have not had a Larineco box in hand, so we cannot say which version is printed on it.

On both versions nano-hydroxyapatite leads the list. On a descending-order label that would mean it outweighs the xylitol, which would be unusual for a gum, and the page gives no figure to confirm or deny it. Our review's summary of the numbers is blunt: "every load-bearing number is missing." No particle size, no per-piece dose, no concentration. The database records the same "not disclosed" as for Underbrush.

Eggshell powder, on Larineco's tab list, is mostly calcium carbonate, the same compound its label list names and Underbrush's list carries. Enamel is calcium phosphate, of which hydroxyapatite is the crystalline form. Our Dentagum review drew that distinction for a different brand and it applies here the same way: the carbonate contributes calcium, not hydroxyapatite, and the two should not be read as the same thing. Neither brand claims they are.

What the two lists share, and what neither says

Xylitol plus erythritol is the sweetener pairing our own gum uses, and I think both brands chose well there. The resin base overlaps heavily: chicle, mastic, myrrh and acacia appear on both brands' lists, and spruce on Underbrush's and on one of Larineco's two. Both add calcium bentonite clay. Underbrush lists a terpene blend; Larineco names one on its tab list and none on its label.

And both leave the same blank. There is no milligram of hydroxyapatite per piece on either page. There is no particle size in nanometers on either page. There is no certificate of analysis to download from either. On the question a buyer most wants answered, how much of the active am I getting, the two brands are identical: they do not say. Our label-by-label test of remineralizing gum explains why that single number matters more than the length of the list.

The studies each brand cites, and what resolved

This is the section where the two brands differ most, and not in a way that flatters either. One cites a great deal and gets a good share of it wrong. The other cites nothing and says it has thousands.

Underbrush: about 39 citations, 8 checked, 5 misresolve

The Underbrush product page links roughly 39 citations. Our citation audit spot-checked eight of them against PubMed and CrossRef on 27 August 2026. Three opened to the record claimed. Two of those three are worth naming because they are solid hydroxyapatite papers: Najibfard and colleagues' 2011 study in the Journal of Clinical Dentistry on remineralization of early caries by a nano-hydroxyapatite dentifrice, PMID 22403978, and Schlagenhauf and colleagues' 2019 six-month randomized trial of a microcrystalline hydroxyapatite dentifrice, PMID 30701704. Both are toothpaste studies, not gum studies, but they resolve cleanly to what the page says they are.

Five did not resolve. Our audit's categories, with what I re-verified on 4 September 2026:

• Wrong record. The xylitol citation, attributed to Makinen, carries PMID 25867215. That ID opens to Shi and colleagues, a 2015 paper in the Journal of Clinical Periodontology on non-equilibrium plasma in ligature-induced peri-implantitis. It has nothing to do with xylitol. I confirmed the title and first author through NCBI's lookup.
• Wrong authors. The mastic-gum citation names "Vukovic AM." The 2006 Archives of Oral Biology paper it appears to point at is by Aksoy, Duran and Koksal. Our audit page carries no PubMed ID for this one, so I could not re-run it and report it as the audit found it.
• Wrong authors. The calcium-carbonate citation names "Zero DT." The 2003 Caries Research paper it points at is by Cury and colleagues.
• Real study, wrong attribution. The mint-oil citation points at a real 2024 pilot study in Microorganisms on the effects of mint oils on the human oral microbiome, PMID 39203382, first author Abdelrahman. The Underbrush page attributes it to different, unnamed authors. I confirmed the record on 4 September 2026.
• Malformed link. The gum-arabic citation places a PMC identifier in a PubMed URL slot, and the link redirects to an unrelated record. No checkable ID survives, so I report it as the audit found it.

About 31 citations on the page were not checked. That is not a finding about them either way. It is a statement of how far the audit got. Five of eight is the sample; what the full 39 would show, nobody on our side knows, and I would rather say that than extrapolate.

What this does and does not mean. A citation that opens to the wrong paper does not prove the claim it was attached to is false. Xylitol's dental literature is large and the page may simply have pasted the wrong ID. But a reader who clicks the link to check the claim is sent somewhere that cannot check it, and on five of eight tries that happened. For a page that leans on its footnotes as hard as Underbrush's does, that is the finding.

Larineco: zero citations on the product page, "thousands of peer-reviewed studies"

Larineco's storefront states that the product is "Backed by thousands of peer-reviewed studies." As checked 4 October 2026, the product page carries no citation, footnote or link. Three other pages on the site list sources: hydroxyapatite toothpaste studies, a lab study of gum arabic and a Men's Health article, plus, on the whitening page, two links to Microsoft Teams chats. None is a study of this gum. A PubMed search for "larineco" returned zero results on 22 August 2026 and again on 4 October 2026, which is expected for a brand under two years old and is not itself a mark against it; the mark is the gap between the sentence on the product page and the absence of a single reference beneath it.

The company's own Terms of Service, captured on the same date, say: "Any research references relate to individual ingredients and may not apply to our specific product formulations." Our review reads that as the company's own statement that the research it alludes to is ingredient-level, not product-level. I think that reading is fair, and I also think the sentence is honest. Ingredient-level research is all any of us in this category have. The difference is that Larineco's storefront does not say so, and its terms do.

Our audit classifies Larineco as a cites-no-studies finding, not a misresolving-citation finding. Those are different failures. Underbrush gave a reader something to check and it often did not check out. Larineco's product page gives a reader nothing to check. Which is worse depends on what you value. I would rather be handed a wrong footnote I can catch than a promise I cannot test, but I can see the other view.

What the hydroxyapatite evidence actually supports

Since neither brand's citations can carry the reader to the literature, here is the shape of it, with PubMed IDs you can open. The strongest single trial for hydroxyapatite in oral care is a toothpaste trial: Paszynska and colleagues, an 18-month randomized controlled trial of 189 adults published in Frontiers in Public Health in 2023, PMID 37533523, which found a hydroxyapatite toothpaste non-inferior to fluoride for caries prevention. The best overview is Wierichs and colleagues, a 2022 systematic review and meta-analysis in Clinical Oral Investigations, PMID 35103837, which found nano-hydroxyapatite comparable to fluoride and called the evidence "not yet conclusive."

For gum specifically, the only peer-reviewed hydroxyapatite gum trial our reviews found is Porciani and colleagues, 2014, in the Journal of Clinical Dentistry, PMID 25122980. It measured dentin hypersensitivity, not cavities, and it did not use either brand's product. Neither Underbrush nor Larineco has a published clinical trial on its own finished gum. Neither do we. Every gum in this category is borrowing toothpaste evidence, and the honest thing to do is say so, which is what this paragraph is for.

The buying experience: price, guarantee, billing, address

This is the section most people searching "underbrush vs larineco" are really asking about. Not the mineral. The money, and whether they will get it back.

Price

Underbrush sells packs of 2, 4 or 8, and its box front prints "18 PIECES"; the page text does not state the count. As checked 4 October 2026 on nathanandsons.com, two packs, 36 pieces, cost USD 29.99 bought once, USD 0.83 a piece; four packs cost USD 44.99 and eight USD 79.99. On subscription, two packs cost USD 20.99 for the first order and USD 23.99 after that, USD 0.67 a piece. Its product page says "Chew 1-2 pieces after meals for at least 30 minutes".

Larineco now prints its own per-piece figure. As checked 4 October 2026 in US dollars, two boxes show USD 39.98 crossed out to USD 19.98 with "$0.55/piece on first order". That price applies to the first order of the subscription only, which renews at "then $29.99/mo" for two boxes, USD 0.83 a piece. Bought once, a box of 18 costs USD 19.98, USD 1.11 a piece, so two boxes cost USD 39.96. Shoppers in Europe see EUR 18.95 a box bought once and EUR 28.43 a month for two boxes on subscription. Two boxes are labelled "1 Month Supply", while the FAQ advises "2 to 3 pieces daily", at which 36 pieces last 12 to 18 days.

Guarantee against policy

Underbrush's storefront carries the line "30-Day Satisfaction Guarantee | Fast Shipping + Easy Returns." Its refund policy, on the same domain and captured on the same date, lists "Chewing gum (all flavors)" as final sale. A paid "Package Protection" add-on covers a "Taste Guarantee," under which, as checked 4 October 2026, "You may request a refund or flavor exchange". New subscriptions "cannot be canceled within the first 10 days." EU orders get the 14-day cooling-off window that EU law requires, with the usual exclusions for consumables. Our database records Underbrush's guarantee in writing as "No | gum is final sale; guarantee only via a paid add-on." So the banner says one thing and the policy says another, and if you ask for your money back it is the policy that answers.

Larineco's refund policy is dated 23 February 2026, unchanged on 4 October 2026, and says what it covers: a 30-day guarantee on "the first purchase of each product per household", return shipping paid by the customer, exclusions that include "Claims based solely on personal expectations of results", and damaged items replaced rather than refunded. The cancellation clause sits in its Terms of Service, section 6: "Cancellation requests submitted after an order has been processed or shipped will not be eligible for refunds." Our database records the guarantee as "Yes | 30-day, first purchase per household only." Our review's line on it was: "The policies, however restrictive, are posted, dated and specific; a refund policy that tells you its limits before you buy is better than a vague one that improvises after." Larineco's product page says more than that: "If for any reason you don't like our gum, you can return it and receive a full refund. No questions asked." So both brands' product pages promise more than their policies. Larineco takes this criterion narrowly, because its policy still refunds a first purchase, while Underbrush's makes gum final sale unless you bought the add-on.

Where Larineco's pages do contradict each other is on claims rather than refunds. The storefront says "Strengthens & protects enamel with nano-hydroxyapatite," carries a "LOVED BY DENTISTS" badge, and states the product is backed by thousands of studies. Its doctors page, headed "Clinically Backed. Dentist Formulated. Naturally Effective.", carries one named quote, from "Dr. Andrew Habib", and links no study. The Terms of Service, same capture date, say the products "are cosmetic oral care items... not intended to diagnose, treat, cure, or prevent any disease, medical condition, or dental disorder." That is the standard disclaimer, and Underbrush carries one too. Underbrush's pages make claims as well: as checked 4 October 2026 its product page lists "Natural & Gentle Whitening", and its FAQ says the minerals help "rebuild tooth enamel and combat decay". What sets Larineco apart is that its own terms go further and call the products "cosmetic oral care items only".

Subscription and billing, as attributed

Both brands sell on subscription. Both have public complaints about it. The scale differs.

For Underbrush, the record we hold is Trustpilot: 2.7 out of 5 from 14 reviews when we checked on 27 August 2026, with 57 percent one-star and 29 percent five-star. One one-star review from May 2026 describes subscription cancellation as "tricky" and mentions "hidden costs behind what seems like a deal." That is one review, and I am quoting it as one review. Underbrush's refund policy's line that new subscriptions cannot be canceled in the first 10 days is the policy fact that sits behind it.

For Larineco, the record is BBB and ScamPulse. As checked 4 October 2026, BBB lists an F rating, 1.83 out of 5 across 103 reviews, and 195 complaints in three years, 180 of them closed in the last 12 months; in August 2026, when the total was 190, they broke down as product 79, delivery 40, service 37, advertising 15 and billing 10. BBB's advertising review of the company, dated 4 March 2025, lists about 20 claims, among them "TRUSTED BY DENTISTS" and "VISIBLE RESULTS IN 4 WEEKS", and in August 2026 BBB recorded no company response. ScamPulse lists more than 28 reports, and our review found the recurring theme to be undisclosed subscription enrollment plus charges after cancellation. Two quotes, attributed and dated. Jessica M., 31 May 2026: "...automatically get signed up for a subscription..." A ScamPulse report of 10 August 2026: "I cancelled the subscription... They billed my ATM card for the $54.31 and sent the three packs of gum any way."

Two things I want to be careful about here. First, these are complaints, and complaints are filed by people who had a bad experience; nobody files a BBB report to say a subscription renewed as expected. Second, our review noted the pattern is about billing, not delivery: "the reports generally describe gum that arrives." Larineco ships. The dispute is over what people are charged and when.

One more Larineco item belongs here because it bears on how much weight to give any on-site number. Its product page shows "4.8 (2,847 Reviews)," while each bundle listing shows an identical "(214,887 Reviews)." The arithmetic: a company whose first domain was registered on 20 September 2024 would need about 290 new reviews every single day since then to reach that figure, and BBB's own count is 103. I am not going to tell you what to conclude. I am telling you the numbers do not agree with each other, and that our database marks third-party-verifiable review counts as "No | on-site widget only" for both brands.

Who you are buying from

Underbrush is made by Nathan & Sons LLC, a Wyoming company. The USPTO shows the UNDERBRUSH mark registered on 1 July 2025 under number 7850981, with first use claimed from 1 April 2023, and a pending combined-mark filing that names Nathan Malonson. The Cheyenne, Wyoming suite on the paperwork is a registered-agent address, which is normal for a Wyoming LLC. A press release on EIN Presswire dated 12 May 2025 is datelined Placerville, California and describes the founder, "Nathan Mal," as a former executive chef. Modern Retail reported the company was founded in 2022, went viral on TikTok around Thanksgiving 2023, hard-launched in January 2024, "surpassed $30 million in sales" in 2024, has fought more than 800 knockoffs and has spent more than a million dollars against counterfeiters. The domain nathanandsons.com was created on 21 June 2023 and is WHOIS-shielded. There is no BBB profile, which our review treats as neutral.

Larineco is sold by Larine C Corporation, doing business as Larine, under New Jersey governing law with arbitration in Ocean County, New Jersey. RDAP shows buylarine.com registered on 20 September 2024 and larineco.com on 21 November 2024, so the brand is under two years old. Our review found three different addresses across the company's own paperwork: Point Pleasant Beach, New Jersey, in the terms of service; a Conroe, Texas apartment in SMS boilerplate, which may belong to a vendor; and Rancho Cucamonga, California, on the store's own contact-information page and at BBB, which also lists the business as a "Sole Proprietorship". Our review reports that as a documented inconsistency and not as an accusation, and so do I. Meta's Ad Library showed on the order of a thousand active results for the brand keyword in August 2026, alongside a six-figure social following. Advertising spend measures advertising spend.

One more item ties the two brands together. Underbrush's own page on scams and knockoffs, as checked 4 October 2026, lists "Larine" under "Fake Websites", linking to buylarine.com. That is Underbrush's claim about a competitor. We have not verified it and do not repeat it as a finding; it is reported here so you know it exists when you compare the two.

What Reddit says, from the threads we read

We have a Reddit page for Underbrush and not for Larineco, so this section is one-sided by construction. Everything below is from our Underbrush Reddit page, which read 11 threads. I have nothing comparable on Larineco to set beside it, and I am not going to pretend a search I did not run.

Genuine product. The threads treat Underbrush as a real gum that arrives. The threads asking whether the brand is legitimate turn out, on reading, to be about counterfeits sold through TikTok Shop and copycat storefronts with names like "Softeland" and "Forrest Folk," not about the real brand. One buyer who reordered from the real store after a copycat experience called it a "Totally different experience." This matters for the comparison because the Modern Retail figures on knockoffs and anti-counterfeiting spend are the same story from the company's side.

Texture. The pieces are small and firm. Most commenters chew two or three at once. The chew is "loved by some, called a brick by others." Two users report losing fillings. I include that because it is in the threads, not because I can verify it, and because a dense tree-resin chew is a materials choice with a known trade-off for people with older dental work. Which filling materials actually hold up best to that kind of daily load is covered in our guide to amalgam, composite and glass ionomer fillings.

Flavor. Gone in 10 to 60 seconds, according to the threads, with a resin aftertaste. That is consistent with a mint flavor sitting seventh on the ingredient list and with no synthetic flavor carrier.

Dose. No commenter in 11 threads asked how much hydroxyapatite is in a piece. I find that the most interesting finding on the page. The question that decides whether the gum can do anything is the question nobody asks.

Safety. One unresolved thread carries a fear about nano-hydroxyapatite and blood vessels. Our Reddit page traced it to a cell-culture paper outside the scope of oral exposure, and noted that the EU scientific committee's opinion on nano-hydroxyapatite, SCCS/1648/22, covers toothpaste and mouthwash and does not cover gum. That is a gap in the regulatory literature for the whole category, ours included, and not a finding against Underbrush.

Who should pick Underbrush, who should pick Larineco, and who should pick neither

Pick Underbrush if you want a firm, long-holding resin chew and you are buying from the company on a plain price. At USD 23.99 for two packs on a running subscription, USD 0.67 a piece, it is the cheaper of the two per piece, and the company has a registered trademark and a trade-press paper trail. Its product page now lists "Natural & Gentle Whitening". Go in knowing three things: the gum is final sale under the refund policy no matter what the banner says, a new subscription cannot be cancelled in its first 10 days, and about five of every eight citations we checked will not take you to the paper claimed. Buy from nathanandsons.com directly; the Reddit threads about bad experiences are about copycats.

Pick Larineco if the ingredient list is what you are buying: a natural-resin base, xylitol with erythritol, and its product page shows two versions of that list. Its refund policy is narrow but it is dated and it says what it covers. Go in knowing that the product page cites no study, that the guarantee applies to the first purchase of each product per household, that cancellations after an order is processed are not refundable under its Terms of Service, and that BBB and ScamPulse hold a documented pattern of billing complaints. If you subscribe, read the cancellation terms before the first charge, not after.

Pick neither if what you want is a number. Neither brand tells you how many milligrams of hydroxyapatite are in a piece, what size the particles are, or what a batch tested at. If your reason for buying a hydroxyapatite gum over a plain xylitol gum is the hydroxyapatite, then you are paying for an ingredient whose quantity both brands decline to state, and the price difference between these gums and a plain xylitol gum is the price of that unstated ingredient. Our ranking of 14 remineralizing gums sorts the whole category on that criterion, and I will say now that our own gum is at the top of it, so read that page with the same suspicion you are reading this one.

Pick neither, and see a dentist, if you have active decay, a cracked tooth or sensitivity that does not settle. No gum treats those. Both brands' terms say the same, and so do ours.

What each brand does well, and our conflict of interest

I sell a competing gum. Minvelle is my company, it makes one product, and that product sits in the same category as the two on this page. There is no version of a competitor comparison where that is not a conflict of interest, and I would rather write it here than have you find it in the footer. Here is what I have done about it, and then here is what each brand deserves credit for.

Every negative fact on this page is attributed to a page, an audit, a registry or a platform, with the date we looked. We used the same categories for both brands: "not disclosed," "wrong record," "cites no studies." We did not use verdict words about either company, and if you find one, tell me and it comes out. Brands update pages. When either of these two publishes a dose, corrects a citation, or changes a policy, the relevant line above is wrong until we re-check it. The "Last reviewed" date at the top is the date this page was last true to our knowledge, and this page is accurate as of 4 October 2026 for Larineco and for Underbrush's prices, guarantee, whitening claim and scams page, and as of 4 September 2026 for the rest of the Underbrush facts.

What Underbrush does well

Our Underbrush review put it this way, and I stand behind each line. "Underbrush's chicle, mastic and spruce base gives a firm, substantial chew that a lot of people genuinely prefer." It carries the standard FDA disclaimer, and per piece it is the cheaper of the two at the one-time and running subscription prices. And on the company: "A Wyoming LLC holding a registered USPTO trademark, a documented founding story, trade-press-reported sales past $30 million in 2024, and a serious, expensive fight against counterfeiters." Our Nathan & Sons page added: "a chicle, mastic, spruce and myrrh chew base is a genuinely characterful materials choice... Whoever wrote this recipe knows the category." It also cited studies at all, which most brands in this category do not, and three of the eight we checked were good ones.

What Larineco does well

From our Larineco review, again verbatim. "Larineco is a real product from a named company... with a disclosed and genuinely interesting ingredient list and marketing running at very large scale. That much checks out." "The ingredient list is disclosed in plain text, which is more than some competitors manage... a materials choice with taste." "Xylitol plus erythritol is exactly the sweetener pairing our own gum uses, chosen for good reasons." "The policies, however restrictive, are posted, dated and specific." "A named legal entity stands behind the store... more accountability scaffolding than anonymous drop-ship storefronts offer." And the complaint record, whatever else it shows, "generally describe[s] gum that arrives."

How to check us the same way

Run the same table on Minvelle and see whether it holds up. Dose: 5.7 mg of nano-hydroxyapatite per piece, 0.30 percent of a 1.9 g piece, on our transparency page. Particle size: rods of 200 nm by 20 to 50 nm, as stated by our supplier. Documents: a safety data sheet and a batch certificate of analysis, downloadable, with the manufacturer's name redacted, and the page says so. Ingredient list: 14 items with per-piece weights. Price: EUR 24.99 for one box of 18 bought once; the subscription is EUR 29.99 for two boxes every four weeks, which works out to EUR 15.00 a box. Guarantee: 30-day refund on unopened boxes, and our policy page says the same. Clinical trial on the finished gum: none, same as both brands above. Trustpilot: claimed profile, two reviews at the time of writing (4 September 2026). If any of those does not match what you find, one of the pages is wrong and I want to know.

Questions people ask about the pair