In brief
If a filling falls out: remove it from your mouth so you do not swallow or inhale it, rinse gently with warm salt water, keep the area clean, avoid chewing on that side, and contact a dental office to arrange repair within days — sooner if the tooth is painful. A lost filling is usually urgent rather than an emergency, but the exposed cavity is softer than enamel and vulnerable to decay, fracture and sensitivity, so it should not wait weeks.
Key takeaways
- A lost filling is rarely a same-hour emergency, but the tooth should be repaired within days.
- Keep the area clean and chew on the other side to protect the exposed tooth.
- Pharmacy temporary filling material can protect the cavity briefly — it is not a repair.
- Severe pain, swelling or a sharp fractured edge raises the urgency.
Why fillings come out
Fillings fail for a reason. Most often, new decay has formed at the margin between filling and tooth, quietly undermining the bond. Other causes include the natural aging of the material, heavy grinding or clenching, biting something hard, or a crack in the surrounding tooth. This matters because it means the fix is often not simply “put the filling back” — the dentist needs to remove any decay and assess how much sound tooth remains before deciding on the repair.
What to do right away
Protect the tooth. Rinse with warm salt water after eating and keep brushing gently — a clean cavity is far less likely to become painful. Chew on the opposite side and avoid very hot, cold, sweet or hard foods, which provoke the exposed inner tooth.
Consider temporary filling material. Pharmacies sell temporary dental cement designed to cover an open cavity for a short time. It can reduce sensitivity and keep food out, but it is a placeholder measure — it does not stop whatever caused the failure.
Do not use household glue. Adhesives not made for the mouth are toxic to the tooth and tissue and make proper repair harder.
Book promptly. Call the office, explain what happened and whether there is pain; the team can judge urgency through their emergency dentistry process. If the same tooth previously held a crown that came off, the guidance in what to do if a dental crown falls off applies instead.
What the dentist will do
The tooth is examined and usually X-rayed to check for decay and assess the nerve. If plenty of healthy structure remains, a new dental filling is often all that is needed. If the cavity has grown large or the tooth is cracked, a crown may be the stronger recommendation. And if decay has reached the nerve — signalled by lingering pain, night pain or sensitivity to heat — the conversation may shift toward the territory covered in do you need a root canal or a dental filling. The longer the tooth stays open, the more likely the repair escalates, which is the practical argument for acting within days.
When urgency increases
Treat the situation as more urgent if the tooth is severely painful, sensitive to everything, has a sharp edge cutting your tongue or cheek, or if swelling or fever develops — swelling means infection, which changes the picture entirely, as explained in what counts as a dental emergency.
Call 911 or seek emergency medical care for trouble breathing, trouble swallowing, uncontrolled bleeding, major facial trauma or other potentially life-threatening symptoms.
When to contact a dentist
Within a few days of losing any filling, even a painless one — and the same day if pain, swelling or a jagged fracture accompanies it. Early repair is usually a single straightforward appointment; delayed repair risks becoming a crown or root canal discussion.
Contact the clinic
If you have lost a filling and have pain, swelling or another urgent concern, contact York Street Dental Centre for guidance on the next appropriate step.
Frequently asked questions
I swallowed the filling. Is that dangerous?
Swallowed filling material almost always passes without harm. Inhaling it — which typically causes coughing — is different and warrants medical attention. Either way, the tooth still needs repair.
The tooth does not hurt. Can it wait a month?
Waiting weeks is risky even without pain. The exposed cavity is soft, traps food and can decay or fracture quickly, potentially turning a simple filling into a larger procedure. Days, not weeks, is the sensible window.
Can the old filling be glued back in?
Unlike a crown, a lost filling generally cannot be reused. The dentist cleans the cavity, removes any decay and places fresh material shaped to the tooth.
Why does the tooth feel sensitive now?
The filling was covering dentin, the softer layer beneath enamel, which contains microscopic channels leading toward the nerve. Air, temperature and sweets now reach it directly. Sensitivity is expected and usually settles once the tooth is restored.
Sources
- Canadian Dental Association — Dental Fillings
- Cleveland Clinic — Dental Emergencies
- American Dental Association (MouthHealthy) — Fillings
This content is intended for general educational purposes and does not replace an examination, diagnosis or personalized treatment recommendation from a dental professional.