Nano hydroxyapatite gum: dose, safety and brands (2026)

Hydroxyapatite gum in seven numbers

If you only read one part of this page, read this table. Each row is answered in full further down, with the study or the page it comes from.

Sources: Newton et al. 2020 (PMID 31743654); SCCS/1677/25; Minvelle transparency page; prices and disclosure from our hydroxyapatite gum database as checked on 4 September 2026.

What is nano hydroxyapatite gum?

Hydroxyapatite is the mineral your teeth are built from. Enamel is roughly 97 percent hydroxyapatite by weight, arranged in long crystals that acid from food and bacteria slowly dissolves and saliva slowly rebuilds. Oral-care companies make a synthetic version of the same mineral and add it to toothpaste, mouthwash and, more recently, chewing gum. “Nano” means the particles are very small, in the EU sense between 1 and 100 nanometres in at least one dimension.

A hydroxyapatite gum puts that powder into a sugar-free gum base, usually sweetened with xylitol, sometimes with erythritol, sorbitol or maltitol, and sometimes with mastic resin added. The idea is simple: chewing makes saliva flow, saliva carries calcium and phosphate back to enamel after an acid attack, and the gum adds a little extra calcium phosphate to that process while you chew.

That is also where the honest limits start. A gum is in your mouth for 20 minutes, the mineral is diluted in a flood of saliva and most of it is swallowed. A toothpaste sits on the teeth during brushing and leaves a film behind. So the question is never “is hydroxyapatite good for teeth” in general. It is whether this amount, in this format, adds anything on top of what a plain sugar-free gum already does. Most of this page is about that gap.

If you want the deeper evidence review, benefit by benefit, read our hydroxyapatite gum benefits guide. This page is the buying version: what to check, what each brand publishes, and how to use it.

Does hydroxyapatite gum work? The evidence, by format

Short answer: the gum habit has good evidence, the hydroxyapatite in the gum has thin evidence, and nobody has tested a hydroxyapatite gum against cavities. Here is the evidence ladder, from strongest to weakest, so you can see which claim rests on which study.

Read across the rows: the gum format helps through saliva, calcium phosphate in gum has in situ support, and hydroxyapatite has caries trials in toothpaste. The one combination nobody has run is a caries trial of a hydroxyapatite gum.

The first row is the strongest thing a gum buyer can lean on. Newton and colleagues pooled the randomized trials of sugar-free gum against no gum and found a 28 percent preventive fraction for caries across 12 trials, and 33 percent when they kept only the 8 trials of xylitol gum (PMID 31743654). They were careful about it:

“tentative evidence”

Newton et al. 2020, JDR Clinical and Translational Research, describing the pooled result because of heterogeneity and moderate trial quality

Notice what those trials tested. Plain sugar-free gum. No hydroxyapatite. So a big part of whatever a hydroxyapatite gum does for you, it does because it is a sugar-free gum you chew after eating.

The calcium phosphate rows matter because they show the add-on idea is not fantasy. In Manton and colleagues' crossover study, ten people chewed gum for 20 minutes four times a day for 14 days while wearing enamel samples with early lesions; the gum with added calcium phosphate (CPP-ACP) produced 18.4 percent remineralization against 8.9 and 10.5 percent for two ordinary sugar-free gums (PMID 18435723). A larger in situ trial by Cochrane and colleagues found the same order (PMID 22488208). That is a different calcium phosphate, though, so it supports the principle, not any hydroxyapatite gum.

The hydroxyapatite gum record itself is two studies. Porciani, Chazine and Grandini ran a double-blind, placebo-controlled trial of a calcium hydroxyapatite gum in 2014: 107 people enrolled, 100 completed, two pieces three times a day, and the outcome was dentin hypersensitivity at one and two weeks (Porciani et al. 2014, PMID 25122980). Hassani and colleagues ran a single-blind in situ study in 2023 comparing a plant-synthesised nano-hydroxyapatite gum, a commercial nano-hydroxyapatite gum and a plain resin gum, and found enamel calcium highest in the commercial nano-hydroxyapatite arm (PMID 37852085). Neither measured cavities, and neither used Minvelle or any other brand on the market today.

Hydroxyapatite in toothpaste is a different story. Two randomized trials by Paszynska and colleagues found a hydroxyapatite toothpaste non-inferior to fluoride toothpaste, in 207 children over a year (PMID 33514787) and in adults over 18 months (PMID 37533523). A 2025 narrative review of 15 clinical studies reported similar efficacy to fluoride for caries prevention, mostly in toothpaste, and asked for standardized long-term studies (PMID 41003396). Those results are real, but they belong to toothpaste. A brand that quotes them on a gum page is borrowing evidence from another format.

Does hydroxyapatite gum really remineralize teeth?

“Remineralize” describes a real process: mineral going back into enamel that acid has partly dissolved, at a stage where the surface is still intact. That stage is called an early lesion, often seen as a chalky white spot. The in situ studies above measure exactly that, on enamel samples worn in the mouth. So yes, gum chewing after meals helps your saliva put mineral back, and gums with added calcium phosphate have done more of it in those set-ups than plain gum.

What no gum does is fill a cavity. Once enamel has broken down into a hole, it needs a dentist. Our page on whether nano-hydroxyapatite can reverse cavities goes through where that line sits. If you have pain, a visible hole or a dark spot that is growing, book a check-up before you buy any gum.

Is nano hydroxyapatite gum safe?

This is the question behind most of the “controversy” searches, and the answer is reassuring once you separate the two things people worry about: the word nano, and swallowing it.

The EU Scientific Committee on Consumer Safety (SCCS) is the European Commission's independent scientific committee for cosmetic ingredients. Its final opinion on hydroxyapatite (nano), SCCS/1677/25, adopted on 26 June 2025, found the rod-shaped, uncoated form safe at up to 29.5 percent in toothpaste and 10 percent in mouthwash. The committee had been more cautious in its 2023 opinion (SCCS/1648/22) and raised the levels after reviewing further data. One detail matters for anyone quoting it: an SCCS opinion is scientific advice, not law. The limits in force are set by Commission Regulation (EU) 2024/858, which permits hydroxyapatite (nano) at up to 10 percent in toothpaste and 0.465 percent in mouthwash.

Neither document assessed chewing gum as a separate product type. The percentages are maximum concentrations judged safe or permitted, not a recommended dose.

On swallowing, the SCCS addressed it directly: hydroxyapatite (nano) that is swallowed during oral-care use dissolves rapidly in gastric fluid into calcium and phosphate, the same ions you get from food. It does not stay in the body as intact nanoparticles. With a gum, some of the mineral will be swallowed with saliva while you chew; the piece itself you spit out and bin.

Two honest caveats. First, nobody has assessed gum as its own category, so any brand that says its gum is “approved” by the SCCS is overstating it; the accurate wording is that the ingredient has been assessed as safe by the SCCS in toothpaste and mouthwash and is permitted under Regulation 2024/858. Second, the SCCS assessed a defined particle: rod-shaped, low aspect ratio, uncoated. A label that just says “nano” without a shape or size gives you nothing to compare against that definition.

The full picture, including pregnancy, kids and the difference to fluoride, is in our nano-hydroxyapatite safety guide.

What is the controversy with hydroxyapatite?

Most of the noise comes from three places. One is the nano label itself, which sounds alarming until you read what the SCCS actually assessed. The second is the 2023 opinion, which was more cautious and still circulates in older articles. The third is the gum category's own marketing. In our citation audit, three of the 14 gum brands we track cited studies that did not open to the record they claimed when we checked them, and one cited a “Harvard Health Study” that does not exist under that name. That is a marketing problem, not an ingredient problem, but it explains why so many dentists stay cautious. The details are in our hydroxyapatite gum citation audit.

Nano vs non-nano hydroxyapatite gum: does size matter?

Nano and micro hydroxyapatite are the same mineral at different particle sizes. In a toothpaste that sits on the teeth, smaller particles can reach into tiny surface defects, which is the main argument for nano. In a gum, the particles are released into a lot of saliva and most of it is gone within minutes, so the coarser levers take over: how much mineral is in a piece, how long you chew, and how often.

There is no gum study that compares a nano with a non-nano hydroxyapatite gum. So nobody can tell you from evidence that one beats the other in gum form, and we do not rank on it. What you can check is whether a brand's nano claim is a number or an adjective. The EU nanomaterial definition covers particles of 1 to 100 nanometres in at least one dimension. A brand that states a size lets you compare; a brand that just prints “nano” does not.

All from each brand's own page as recorded in our hydroxyapatite gum database, checked 4 September 2026 (Dentagum 7 October 2026).

Our own view, stated plainly: particle size is a real property, but in a gum it is a quiet one. We publish ours because a number you can check beats an adjective you cannot, not because a smaller number wins. The long version is in nano vs non-nano hydroxyapatite in gum.

How much hydroxyapatite is in a piece of gum?

This is the question that separates the category. A toothpaste tells you its concentration because the law around it makes that normal. Gum brands mostly do not. Of the 14 hydroxyapatite gums we track, two publish a per-piece amount, and only one of those is a pure hydroxyapatite figure.

Minvelle publishes 5.7 mg of nano-hydroxyapatite per piece. A piece weighs 1.9 g, so that is 0.30 percent of the piece. Crait prints 70 mg per piece of OMYADENT, a mineral composite with a calcium carbonate core and a hydroxyapatite shell, but neither Crait nor its supplier publishes how much of that 70 mg is hydroxyapatite. Every other brand in the table below states no per-piece amount at all.

“Not published” in this table means the brand's own page did not state the figure when we checked. It does not mean the figure is zero, and we never estimate a dose a company has not stated.

Checked against each brand's own page on 4 September 2026 (Dentagum 7 October 2026), from our hydroxyapatite gum database and the table in our best remineralizing gum list. Prices are in the currency each brand sells in. The table is sorted by what each brand publishes, not ranked. RevitaBite is in the database without a verified price or claim, so it is not shown here.

Why do so few brands publish a dose?

We can only guess at motives, so here are the practical reasons instead. A dose is a number someone can test. Once it is on a page, a lab result can contradict it. Publishing a batch certificate ties that number to a production run that actually shipped. Without a batch document, “nano-hydroxyapatite” on the front is a list position, not a quantity.

Is 5.7 mg a lot? Honestly, nobody knows the optimal amount for a gum, because the dose-finding study has not been done. The concentration studies on nano-hydroxyapatite were done in vitro on enamel samples, not in gum. What a published dose gives you is not proof of an effect. It gives you something to compare, and something the brand can be held to. That is why we publish ours with a guarantee attached; the full figures sit on our transparency page, and the reasoning is in how many mg of hydroxyapatite are in gum.

How long should you chew hydroxyapatite gum?

At least 20 minutes, after eating or drinking. That number is not ours. It is the condition attached to the EU's authorised health claim for sugar-free gum:

“the beneficial effect is obtained with chewing, for at least 20 minutes, after eating or drinking”

Commission Regulation (EU) No 432/2012, condition of use for the claim that sugar-free gum contributes to the maintenance of tooth mineralisation

The saliva studies explain why. In Dawes and Kubieniec's 2004 study, ten adults chewed sugar-free gum for two hours; salivary flow rose sharply at first, settled after 35 to 40 minutes and stayed significantly above the unstimulated rate the whole time, and salivary pH stayed higher from the second minute on (PMID 15196984). The first minutes give the biggest burst, but the 20-minute mark is where the claim and the trials line up.

Timing matters as much as length. The useful window is right after a meal, a snack, coffee, wine or citrus, when the mouth is most acidic. Chewing at random in the middle of the afternoon still makes saliva, but the acid you are trying to buffer is not there.

How many pieces a day? Is 2 pieces of gum a day too much?

Two pieces of sugar-free gum a day is not too much for most adults. The hydroxyapatite sensitivity trial used two pieces three times a day, six in total, for two weeks. Our own usage line is one piece a day, after a meal, chewed for at least 20 minutes, which is also how a box of 18 pieces lasts 18 days. If you chew more, the limit you will notice first is your stomach, not the mineral: the sweeteners in sugar-free gum, xylitol included, can cause bloating and loose stools in larger amounts, and the Cochrane review on xylitol lists exactly those effects ({pm(25809586)}).

If your jaw clicks or aches, cut back. Long chewing sessions are a known irritant for people with jaw joint problems, and no mineral is worth a sore jaw.

Hydroxyapatite gum vs xylitol gum

Most hydroxyapatite gums are also xylitol gums, so this is less a choice between two products than a question of what the hydroxyapatite adds. Xylitol has the longer research record. The 8 xylitol-gum trials in Newton's meta-analysis gave a 33 percent preventive fraction against no gum ({pm(31743654)}), and a 2025 systematic review comparing xylitol with sorbitol gum found caries occurrence decreased in 3 of 5 trials with xylitol gum and suggested it as “an adjunct to toothbrushing” ({pm(40731400)}).

Two catches. First, the xylitol trials that show the biggest effects used about 5 to 10 g of xylitol a day, spread over several chews. One piece of Minvelle carries 817 mg of xylitol, which is useful as a sweetener and for saliva, and nowhere near a trial dose on its own. Second, xylitol does not add mineral. A 2014 in situ study of xylitol, sorbitol and mixed gums found no significant change in the enamel calcium-to-phosphorus ratio after 21-day chewing periods, although microhardness rose in every group (PMC4241604). Xylitol works on bacteria and saliva; the hydroxyapatite is there to add calcium phosphate.

If you want the xylitol side in full, our xylitol guide covers doses, side effects and why xylitol is dangerous for dogs.

Hydroxyapatite gum vs hydroxyapatite toothpaste

These do different jobs, and the evidence is lopsided in toothpaste's favour. Hydroxyapatite toothpaste has randomized caries trials: in two trials by Paszynska and colleagues it was non-inferior to fluoride in 207 children over a year (PMID 33514787) and in adults over 18 months (PMID 37533523). An independent systematic review by Wierichs and colleagues found nano-hydroxyapatite matched sodium fluoride under remineralizing conditions but not when acid was actively pulling mineral out (PMID 35103837). Gum has none of that for cavities.

What gum has instead is timing. You brush twice a day; you eat three to five times. Gum covers the hours after lunch or coffee when a toothbrush is not an option. That is why the sensible routine is both, not one or the other: toothpaste for the daily mineral layer and the fluoride or hydroxyapatite contact time, gum for the after-meal acid window.

Sensitivity meta-analysis: de Melo Alencar, Guanipa Ortiz et al. 2019 (PMID 30611773).

A gum can never replace brushing, because it does not remove plaque from the gumline or between teeth, and because its mineral contact is brief. Anyone selling a gum as a toothpaste substitute is selling you a story.

Who should not chew hydroxyapatite gum?

Hydroxyapatite itself has no known safety signal at oral-care levels. The reasons to skip a hydroxyapatite gum are mostly about gum and its sweeteners:

• Young children who cannot chew gum safely. Gum is a choking risk for small children, whatever is in it. Our guide on when kids can chew gum covers the age question.
• People with jaw joint pain or clicking. Twenty minutes of chewing can aggravate it. Ask your dentist first.
• People sensitive to polyols. Xylitol, sorbitol and maltitol can cause bloating, cramps and loose stools; the Cochrane review on xylitol lists these effects (PMID 25809586). Start with one piece a day.
• Anyone allergic to an ingredient. Read the full list. Minvelle contains mastic resin, for example; ours is published in full on the transparency page.
• Households with dogs. Xylitol is dangerous for dogs, even in small amounts. Keep the box out of reach.
• Anyone with pain, a visible hole or a growing dark spot. That needs a dentist, not a gum. No gum treats an active cavity.

If you are pregnant or have a medical condition, there is no evidence against hydroxyapatite gum, but the sensible step is the same as for any new routine: mention it at your next dental visit.

What do dentists say about nano hydroxyapatite?

It depends on where they trained. Hydroxyapatite toothpaste has been used in Japan for decades, and many dentists in parts of Europe suggest it. In the US and UK, fluoride is still the named standard in guidelines, and guidelines move slowly by design. The independent evidence supports cautious optimism: comparable to fluoride in some conditions, not proven better, and strongest for sensitivity. Our article on why some dentists do not recommend hydroxyapatite goes through the reasons one by one.

For gum specifically, most dentists will tell you what the evidence says: chewing sugar-free gum after meals is a good habit, and the mineral in it is a plausible extra, not a treatment. If your dentist is sceptical, bring the dose. “This gum has 5.7 mg of nano-hydroxyapatite per piece and here is the batch certificate” is a better conversation than “it says remineralizing on the front”.

Six checks before you buy any hydroxyapatite gum

These checks work on every brand, ours included. They take five minutes on the brand's own website.

• Is there a milligram amount per piece? Not a percentage claim in an FAQ, an amount on the product or ingredient page.
• Is there a batch document? A certificate of analysis or test report you can download, tied to a batch.
• Is the particle size a number? “Nano” without a size cannot be checked against the EU definition.
• Do the citations open? Click two PubMed links. Check the paper is about what the brand says, and whether it tested gum or toothpaste.
• Is the price per piece findable? You need both a pack size and a price. Some brands publish neither clearly.
• What does the refund policy say? Read the policy page, not the banner, and check whether opened boxes are covered.

Our longer checklist is in nine checks for whether a remineralizing gum is legit, and every brand's answers are pre-filled in the hydroxyapatite gum database.

Where Minvelle fits, stated honestly

We make Minvelle, so here is what it is and is not, in one place. It is a sugar-free gum with 5.7 mg of nano-hydroxyapatite and 817 mg of xylitol per piece, with mastic, 18 pieces per box, one piece a day after a meal. The full 14-ingredient list, the safety data sheet and the batch certificate are published on our transparency page. It is the only gum in our database that publishes a hydroxyapatite dose per piece together with a particle size and a batch certificate.

What it does not have: a clinical trial on the finished gum. No brand in the category has one. The evidence we point to is the same gum-format record every brand can point to. It is also the priciest per piece if you buy a single box, at about €1.39; on the plan, 2 boxes every 4 weeks for €29.99, it comes to about €0.83 a piece. Some of the brands in the table are cheaper per piece. They just do not tell you how much hydroxyapatite you are paying for.

We are not putting ourselves first on this page. For the ranked comparison, with the method and every brand's grade, see best remineralizing gum 2026. Whitening, if that is why you are here, means surface stain only: chewing after coffee or tea helps lift fresh surface stain, and it never changes the shade of your teeth.

An outside view, for balance: the trends site Trendsicle wrote that Minvelle is “the only brand we found anywhere that prints a per-piece number”, and in the same note pointed out that it is not sold on Amazon in the US. Both are true. You buy it from our own shop, and it ships to 35 countries.

If you want to try it, the simplest start is two boxes: €39.99, free shipping, and the second box stays refundable while you decide, because our refund covers unopened boxes for 30 days. See the plans on the product page.

Questions people ask about hydroxyapatite gum