A filling fell out or your crown came off: what to do before the dentist

How fast, and where to go, by situation

Swipe sideways on mobile. When in doubt about which tier you are in, treat it as the more urgent one and call.

The 30-second answer, before anything else

You have lost a filling or a crown, it barely hurts, and it is probably the evening or the weekend. The honest first thing to say is the unglamorous one: this needs a dentist, and nothing you can do at home is a repair. Everything below is about protecting the tooth for a few days so the cheap outcome stays on the table. It is not a fix, and it does not make the appointment optional.

So here is the whole thing in a few lines. Find the crown if it came off in one piece and keep it. Do not glue anything, and above all do not reach for household superglue. Keep the area meticulously clean, brush it gently rather than avoiding it, and chew on the other side. Rinse with warm salt water after meals. Then call your dentist in the morning, and call the same day if there is pain that wakes you, facial swelling, fever, a bad taste or discharge, or a sharp edge cutting your tongue or cheek.

The one sentence to carry with you is this: the tooth starts moving the moment the crown is off, and the fit is what you are racing. That is why the panic question, is this an emergency tonight, is usually the wrong question. The better question is how fast does this need fixing, and the answer is almost always faster than it feels. If you take nothing else from this page, take that, and the fact that superglue and chewing gum both belong nowhere near the tooth.

First, which of these actually happened

Four different things get called the same thing, and the advice diverges, so it is worth thirty seconds to work out which one you are dealing with. Look at what is in your hand and what the tooth looks like in the mirror.

The quickest tell is what the surface in your mouth feels like with a clean tongue. A shaped stub left by a lost crown feels smooth and even, almost polished, because it was prepared that way before the crown was ever fitted. A lost filling leaves a rough, hollow crater with defined edges you can catch a fingernail on. A broken tooth feels sharp or jagged and often shows a fresh, lighter-coloured surface where it fractured. Matching what you feel against what is in your hand tells you which of the four situations is yours, and therefore which stretch of advice on this page applies to you and which you can skip.

A permanent crown, off in one piece. The tooth underneath is a smooth, shaped stub, and the crown is a hollow cap. This is the most re-cementable of the four, and keeping the crown safe is the priority. It is usually not painful, because the nerve is often gone or heavily protected, which is exactly why people wait too long.

A temporary crown, off mid-treatment. If you are between appointments, waiting for a lab-made crown, the plastic or metal temporary that was covering your prepared tooth has come off. This is the most time-critical situation on this page, and most people do not realise it. The temporary is what stops the tooth drifting before the real crown arrives, so an unprotected prep can shift enough in days to compromise the fit of the crown already being made. Call the practice that is treating you promptly, even if nothing hurts.

A filling lost from a cavity. A piece of your filling, amalgam, composite or otherwise, is gone, and you can feel or see an open hole in the tooth. The concern here is the exposed dentine and the food that will pack into the cavity at every meal. Keep it clean, keep sugary and sticky food out of it, and get it replaced.

A piece of tooth broke away with it. If what came out includes tooth structure, or the tooth itself is now sharp, chipped or cracked, this is a different article and we will not duplicate it. Read our guide to cracked teeth and, if a larger fragment or a whole tooth is involved, the first aid for a knocked-out or broken tooth. Those pages own damage to the tooth itself. This one owns the man-made part.

Is this an emergency? The honest triage

Three tiers, and the point of them is to be unambiguous. Most lost crowns and fillings are not a middle-of-the-night emergency, and pretending otherwise helps nobody. But some situations are, and the difference is worth knowing before you decide whether to sit tight until morning.

Now, not tomorrow. Facial swelling, fever, a bad taste or discharge in the mouth, pain that wakes you or does not settle with ordinary painkillers, or any difficulty breathing or swallowing. These are signs the problem is no longer just a missing restoration, and an infection is not something to wait out. Read why a dental abscess cannot be waited out and seek urgent care. Trouble breathing or swallowing is a medical emergency, not a dental one, and it means going to an emergency department, not waiting for a dental slot.

Same day or the next. A lost temporary crown mid-treatment, a sharp edge that is cutting your tongue or cheek, or sensitivity that is clearly getting worse rather than settling. None of these will kill an evening, but none of them should drift into next week either. Book the earliest appointment you can get.

Within days, not weeks. An intact permanent crown that came off cleanly, with no pain and no sharp edge. This is the reassuring case, and it is still not a whenever case. The next section explains why the quiet, painless version is the one that costs people the most money. If the main issue is pain rather than the missing part, use our decision tree for tooth pain at night to work out what is driving it, rather than guessing.

The honest use of these tiers is to stop two opposite mistakes at once. One is treating a calm, painless lost crown as a crisis and sitting in an emergency room half the night for something that only wanted a routine slot in the morning. The other, far more common, is treating a genuinely time-sensitive problem as nothing at all because it does not hurt, and letting a week slide past that quietly closes off the cheap fix. Read the tier you are in, act at that speed, and if you honestly cannot tell which of two tiers fits, treat it as the more urgent of the two and make the call.

What to do with the crown itself

If a permanent crown came off in one piece, the single most useful thing you can do is not lose it. An intact crown on a sound tooth is often re-cementable, and re-cementing is the cheap outcome. Throwing it away, or letting it rattle loose in a pocket until it is scratched or bent, closes that door for no reason.

Rinse it gently under the tap to get food off it, then keep it dry in a small container or a folded tissue in a box, not loose where it can be crushed or dropped down a drain. Take it to the appointment even if it looks chipped or has a dark lump inside, because that lump is often old cement or part of the core, and the dentist wants to see the fitting surface and exactly what came away with it. What looks like a ruined crown to you is often perfectly usable, and what looks fine can hide the reason it failed.

There is a simple way to store it that avoids the two most common losses. A small pill box or a hard contact-lens case is ideal, but a folded paper tissue tucked inside any rigid container works just as well. Avoid wrapping it only in a loose tissue you might throw away by reflex, and keep it well off bathroom shelves and edges where it can bounce into a sink or a drain. If you carry the crown to the appointment loose in a pocket, it can rub against keys or coins and pick up scratches on the fitting surface, and that surface is precisely the part the dentist reads to judge whether the crown can go back on. The crown is small, it is easy to mislay, and a lost crown removes the cheapest option on the table before you even sit in the chair.

Two warnings deserve their own lines. A crown that comes off while you are eating can be swallowed, which is usually uneventful and passes without trouble, so mention it here only so nobody panics. Far more rarely it can be inhaled. Coughing, wheezing or chest discomfort after losing a crown is an immediate medical matter, not a dental one, so do not wait to see your dentist about it. And do not try to jam the crown back on and leave it sitting there unsecured overnight. A loose cap balanced on a stub is exactly how a crown gets swallowed in your sleep.

Why "it doesn't hurt" is the wrong test

This is the section that earns the page, and it is aimed squarely at the reader who has decided that because it does not hurt, it can wait for a convenient appointment in a few weeks. That decision is the expensive one, and here is the mechanism nobody explains. Three separate things are happening while nothing hurts at all.

The teeth drift. Teeth are not fixed in concrete. They sit in bone and they move under the light, constant forces of biting and neighbouring contact. With a crown gone, the teeth on either side lean into the gap and the tooth in the opposing jaw over-erupts slightly toward the space. This happens over days to weeks, not months, and it is enough that a crown built to fit that exact tooth may stop seating cleanly. The crown that could have been popped back on in one short visit no longer fits, and now it has to be remade.

The dentine dissolves. The surface now exposed is dentine, which is softer than enamel and, importantly, dissolves at a milder acid level than enamel does. Our guide to root and gum-line decay explains why exposed dentine and root surfaces give way at a pH where enamel would still hold, and the difference between cavities and enamel erosion is worth reading for the distinction. In plain terms: the bare surface under a lost restoration is the part of the tooth least able to resist acid, and it is now getting the full force of every meal.

The margin is open. The seam where a restoration meets tooth, the margin, is where restorations die. Our article on how fillings compare and why they fail makes the point that secondary decay at the margin is the main reason fillings and crowns get replaced. When the restoration is gone, that margin is not just leaking, it is wide open, and bacteria and acid reach the vulnerable interface directly.

It is worth being concrete about the timescale, because the phrase days to weeks does a lot of quiet work. In the first day or two little may be visible or noticeable, which is exactly what lulls people into leaving it. By the end of a week the contact with the neighbouring teeth can already feel tighter, and the crown that slid on without any resistance before may now catch at one edge. This is not a straight line, and it varies from person to person and from tooth to tooth, but the direction of travel is one way only, toward a worse fit, and it does not quietly reverse on its own once the drift has happened. That is the part that makes the painless case deceptive: the process that costs you the money is silent, gradual and already underway.

Put those together and the money point is simple, and there is no need to scaremonger it. The difference between a re-cement and a full remake is largely a question of how fast you go. Nothing here is a promise that your crown will go back on, because that depends on why it came off. But waiting turns a good outcome into a worse one for reasons you cannot feel, and by the time you can feel them, the cheap path is often already gone.

What helps in the meantime, and what to never do

Keep the list short and in order. The aim is to protect the tooth for the few days before you are seen, not to treat it. If any step feels uncertain, the safest move is always to leave the tooth alone and go in sooner.

Never use superglue or any household adhesive. This is the strongest sentence in the article, so read it twice. Household superglue is cyanoacrylate. It is not an intra-oral, biocompatible material, it can injure the pulp and the soft tissue of your mouth, and it can permanently contaminate the fitting surface of the crown. That last part matters even if nothing hurts: a crown that could have been cleaned and re-cemented can become impossible to re-fit once glue has set inside it, which turns a simple visit into a crown-lengthening or extraction conversation. Every dental body that addresses this says the same thing. Do not do it.

The rest of the never list is shorter. No picks, files, wires or attempts to clean out or reshape the cavity yourself, because you cannot see what you are doing and you can easily damage the tooth or the gum. No aspirin or painkiller tablet held against the gum, which does not relieve a toothache and does chemically burn the tissue. And no waiting to see whether it settles on its own, because the one thing this problem does not do is heal itself.

One more quiet mistake is worth naming, because almost everyone does it. That is testing the tooth over and over with the tongue or a fingernail to check whether it still feels the same. It is a natural reflex, it does no good, and pressing repeatedly on a bare stub or a loose margin can work things looser and push debris further into the gap. Notice yourself doing it, leave the tooth alone, and let the appointment do the checking. Poking at it changes nothing except, occasionally, for the worse.

The chewing-gum question, answered against ourselves

People plug the hole with chewing gum. It is a real and widespread folk fix, and because it is so directly adjacent to what a gum company makes, this is the most credible thing we can tell you on this whole page: do not do it. Chewing gum is not a temporary filling, and being sugar-free does not change that.

Packing gum into an open cavity presses bacteria down into it, it can pull on a margin that is already failing and drag a loose restoration further off, and it holds fermentable material against the exact exposed dentine you are trying to protect. Our own guidance on chewing gum with dental work is blunt about the limit: a gum cannot repair, reseal or re-cement anything. That is true when the work is intact, and it is more true when the work is gone. A gum is for chewing, not for filling a hole in a tooth.

What happens at the appointment

Knowing what the visit involves is the point of this section, because a reader who knows roughly what happens is a reader who actually books. The first thing the dentist does is work out why it came off, because that decides everything that follows. The crown coming loose is a symptom, not the diagnosis.

Expect the visit to begin with a close look and often an x-ray, because much of what decides the outcome sits below the gum or inside the tooth where the eye cannot reach. The dentist checks whether the margin is sound, whether there is decay at or under it, whether the core that the crown was built up on is still solid, and whether the tooth is tender to gentle pressure in a way that hints at trouble in the nerve. This is also where the piece you kept earns its place: bring the crown or the fragment of filling, because the fitting surface and the shape of what came away often answer the why faster and more cheaply than any test can, and they tell the dentist whether the old restoration is a candidate to go straight back on.

If an intact crown is sitting on a sound, healthy tooth, it is cleaned and re-cemented, and that is the outcome everyone is hoping for. If there is decay underneath, that has to be removed first, and depending on how much tooth is left, the plan can change. If the core or post that built up the tooth has failed, or the tooth beneath has fractured, it may need rebuilding before anything can be re-fitted, and sometimes a new crown is genuinely unavoidable. None of this can be promised from a photo or a phone call, which is why the tooth needs to be seen rather than guessed at.

A lost filling is usually replaced, and our guide comparing amalgam, composite and glass ionomer covers the material choice and the repair-versus-replace question in detail. Expect the tooth to feel a little sensitive for a while afterwards, which is usually normal; what is normal after a filling and what is not lists the warning signs worth a call. Where the nerve is involved, when a root canal is actually needed explains that path. We will give you no prices and no timelines here, because both vary too much by country to be anything but misleading.

One more case worth a line. If the work that just failed was done abroad, the practical problem is usually records, materials and who takes responsibility, not the country itself. A new dentist may not know what was used or how the tooth was built up, which can slow the fix. Our guide to dental work done abroad and its section on aftercare logistics covers how to handle that without turning it into a saga.

Keeping the next one in place

Once the tooth is fixed, a handful of things genuinely lower the odds of a repeat, roughly in order of how much they matter. This is also the one place on the page where our own product has an honest role, and only after the appointment is done.

Clean the margin every day. Restorations fail at the seam where they meet the tooth, so daily cleaning at the gumline and between the teeth does more than any product choice. Floss or an interdental brush at the margins of your crowns and fillings is the single highest-value habit here.

Protect against grinding. Clenching and grinding end more restorations than chewing ever does, by loading them with forces they were not built for. If you grind, protecting your teeth from night grinding is worth reading, because a night guard can outlast several crowns.

Keep your recall appointments. The point of routine check-ups is to catch a leaking margin while it is still a margin, before it becomes a lost filling on a Friday night. A restoration that is quietly beginning to fail is easy to see and cheap to address early.

Treat sugar frequency, not just quantity. It is how often acid hits the tooth that drives decay at the margins, more than the total amount. Fewer separate sugar hits across the day protects your restorations more than cutting the size of any one of them.

None of these is dramatic, and that is rather the point. The restorations that last a long time are the ones cleaned daily at the seam, kept off the tooth that is loaded at night by grinding, checked on a regular recall, and not bathed in frequent sugar. A crown or a filling is a repair, not a fresh start, so the tooth around it still needs the same care it always did, and honestly a little more attention at the margins where the old tooth meets the new work. The habits are ordinary. Doing them consistently, at the exact spot that fails, is what separates a restoration that lasts a decade from one that comes off on a weekend.

That leaves the honest product moment, confined to here and to the period after the tooth is fixed. Chewing a sugar-free gum after meals raises saliva flow, and saliva helps clear acid away from the margins of the restorations you still have; our pages on why saliva matters and the evidence on sugar-free gum and dry mouth cover the mechanism and its limits. A gum like Minvelle is a complement to fluoride brushing, never a replacement for it, and it does nothing at all for a restoration that is already out. Used sensibly it is one small habit among the others above, and the appointment remains the whole point of this page.

The things people actually ask