Filling Fell Out During a Meal? What to Do and When to See a Dentist

It usually happens with something chewy. You are eating, there is an odd crunch or a change in texture, and you find a small hard fragment in your mouth that is clearly not food. Running your tongue over the tooth confirms it: there is now a hollow where there was a filling.

It is a disconcerting moment, and patients often assume it constitutes an emergency. In most cases it does not. But it does need attending to reasonably promptly, and there are a few things worth doing — and not doing — in the meantime.

Stop and clear your mouth carefully. Locate the fragment. The immediate concern is not the tooth but ensuring you have not swallowed or inhaled anything. Swallowing a small piece of filling material is not harmful and it will pass; the rare but more serious scenario is inhaling a fragment, which would typically cause coughing or a persistent tickling sensation. If you develop a cough that will not settle after losing a piece of filling or crown, seek medical advice.

Rinse gently with warm water. This clears debris from the cavity. Do not use anything stronger initially, since the exposed dentine may be sensitive.

Check with your tongue, gently. You are feeling for sharp edges that might cut your tongue or cheek, and for whether a large piece of tooth has come away alongside the filling.

Look, if you can. A mirror and good light will tell you whether you are looking at a shallow crater or a substantial hole, and whether the surrounding tooth structure appears intact.

For a filling, honestly, not really. Amalgam or composite that has come out cannot be re-cemented — a replacement filling is made fresh, and the old material has no use.

There is one qualification. If you are not certain whether what came out was a filling or a crown, keep it. A crown can very often be re-cemented, which is a much quicker and less expensive appointment than making a new one. If it is a definite crown, put it somewhere safe, do not attempt to superglue it back in, and bring it with you. Our article on emergency crown placement covers that situation.

If you are unsure, keep it. It costs nothing and lets us tell you exactly what happened.

Chew on the other side. The remaining tooth walls without their internal support are more prone to fracture. A tooth that loses a cusp becomes a considerably bigger and more expensive problem than one that loses a filling.

Keep the area clean. Continue brushing normally, and clean the cavity gently. Food packing into an open cavity causes discomfort and can accelerate decay. Rinsing after meals helps.

Temporary dental cement. Available from pharmacies, this can be pressed into the cavity to cover exposed dentine and reduce sensitivity. It is a stopgap for a few days, not a repair, and it should not be used to postpone treatment indefinitely.

Avoid extremes of temperature if the tooth is sensitive. Exposed dentine transmits cold sharply.

Do not use household adhesives of any kind, do not pack the cavity with cotton wool or chewing gum, and do not place aspirin against the tooth or gum — it causes a chemical burn of the soft tissue.

Within a few days is usually fine if the tooth is comfortable, there are no sharp edges cutting your tongue, and the cavity is small.

Within a day or two if the tooth is sensitive to hot and cold, there are sharp edges, the cavity is large, or the tooth is a front tooth and the appearance bothers you.

Urgently — same day if possible if you have any of the following:

• Severe or spontaneous pain, or pain that wakes you at night

• Pain lasting more than a few seconds after cold or heat

• A large piece of tooth has broken away alongside the filling

• Any swelling of the gum or face

• A bad taste or discharge from the area

• Pain on biting that has appeared since the filling came out

Severe lingering pain suggests the pulp is involved rather than simply exposed dentine — see our article on exposed tooth nerve. Swelling with fever needs urgent attention, as covered in fever with facial swelling.

Understanding this helps prevent a repeat.

Recurrent decay at the margin. The most common reason. Decay develops at the junction between filling and tooth, undermining the filling until it loses its seat. This frequently causes no symptoms at all until the filling comes out. Our article on cavities in back teeth explains why these sites are vulnerable.

Age and fatigue. Fillings are not permanent. They flex thousands of times a day and materials eventually fatigue. A filling that has served twenty years has done well.

Bond failure. Composite fillings rely on a bond to the tooth, and that bond degrades over time, particularly at margins in dentine rather than enamel.

Fracture of the surrounding tooth. Sometimes the filling has not failed — the tooth around it has. Large fillings leave thin walls of remaining tooth that can crack under load.

Grinding and clenching. Repeated heavy loading accelerates all of the above. If this applies to you, a night guard is worth discussing.

Sticky foods. Toffee and similar foods generate substantial pulling force. They rarely dislodge a sound filling but will find one that is already failing. In that sense the toffee is the trigger, not the cause.

At the appointment we will examine the tooth, usually take a radiograph to see what is happening beneath and between the teeth, and check the pulp's response.

A new filling is the usual outcome where sufficient sound tooth remains. See white fillings.

An onlay or crown may be recommended if too little tooth structure remains for a filling to be predictable — particularly if a cusp has fractured. This is where the amount of remaining tooth becomes decisive, a principle explained in our article on the ferrule effect. See also dental crowns.

Root canal treatment if the pulp is irreversibly inflamed or has died. See root canal treatment.

Extraction in the minority of cases where the tooth cannot be predictably restored. Our article on crown versus extraction discusses that decision.

We will explain which applies and why before proceeding.

Fillings are checked at every routine examination, and a filling showing early signs of breakdown can be replaced electively — at a time that suits you, before decay progresses, and usually with a smaller restoration than would be needed later.

That is the practical argument for regular check-ups: most restorative work is cheaper, quicker and less invasive when it is planned rather than reactive. Our article on regular hygiene visits versus emergency care sets out the wider case, and pricing is available on our site.

Is a filling falling out a dental emergency?

Usually not. If the tooth is comfortable and there are no sharp edges, it can generally wait a few days for a routine appointment. It becomes urgent if you have severe or lingering pain, swelling, a bad taste, pain on biting, or a large fragment of tooth has broken away. The reason not to leave it for weeks is that an open cavity accumulates plaque and food, decay progresses more quickly, and the unsupported tooth walls are vulnerable to fracture — which turns a filling into a crown.

Can I put the filling back in myself?

No. Filling material cannot be re-bonded once it has come out, and attempting to fix it in place with household adhesives risks damaging the tooth and complicating treatment. Temporary dental cement from a pharmacy is a reasonable short-term measure to cover the cavity and reduce sensitivity for a few days, and it is designed to be removed easily. If what came out was a crown rather than a filling, keep it and bring it in — crowns can frequently be re-cemented.

Will I need a root canal now?

Not necessarily, and in most cases no. Losing a filling exposes dentine, which is sensitive but not the same as exposing the pulp. Root canal treatment becomes relevant if the pulp is irreversibly inflamed or has died, which is suggested by severe spontaneous pain, pain lingering for minutes after cold, or pain that wakes you at night. The dentist will test the tooth and take a radiograph to assess this rather than assuming either way.

I swallowed the filling — is that a problem?

Almost certainly not. Small pieces of dental material pass through the digestive system without incident. This applies to amalgam fragments as well. What warrants attention is the possibility of inhaling a piece rather than swallowing it, which would typically cause immediate coughing or a persistent irritating cough afterwards. If you develop an unexplained cough after losing a filling or crown, mention it to your GP.

Why did it come out while I was just eating normally?

Fillings very rarely fail suddenly in isolation — the food is usually the final straw rather than the cause. Most often there is recurrent decay at the margin that has been quietly undermining the filling, or the bond has degraded over years of function, or the surrounding tooth has cracked. Something chewy or sticky then provides the load that completes the process. The radiograph taken at your appointment will usually show which of these applies.

How long can I leave it if it does not hurt?

We would not recommend leaving it more than a couple of weeks even if it is entirely comfortable. Absence of pain is not evidence that nothing is happening — decay progresses without symptoms until it is quite advanced, and an open cavity is an ideal environment for it. The tooth is also structurally weaker without the filling supporting it. Prompt replacement is nearly always the smaller and less expensive intervention.

If you have lost a filling, contact us and we will arrange an appointment appropriate to the urgency of your situation. If you are in significant pain or have any swelling, tell us when you call so we can see you sooner.

Read more about white fillings and emergency dental care, or contact the practice on 020 7183 0692.

This article provides general information and does not constitute individual dental advice. It is not a substitute for examination by a dentist. Any self-care measures described are temporary comfort measures only and do not treat the underlying problem. If you develop facial swelling, fever, difficulty swallowing or difficulty breathing, seek urgent medical attention by contacting NHS 111 or attending A&E. Always read the patient information leaflet for any medicine or product and consult a pharmacist if you are unsure whether it is suitable for you. Wimpole Dental is regulated by the Care Quality Commission, and our clinicians are registered with the General Dental Council.

Next review due: 11 September 2027