Question: What happens if a filling falls out completely?
Explanation: A lost filling leaves an open cavity exposing dentine and sometimes approaching the pulp. Sensitivity to cold and sweet foods is typical. Food packs into the cavity, which is uncomfortable and accelerates decay. If the filling was very deep, the pulp may be close to the surface and severe pain can develop. Rinse with warm salt water, keep the cavity clean, use temporary cement if available, and avoid chewing on that side. See a dentist promptly. A cavity left open for months frequently ends in root canal treatment.
Related Questions:
Should I swallow or keep a filling that falls out?
Neither matters much clinically, as old fillings are not reattached. Swallowing an amalgam filling is not harmful, though it should not be inhaled. The important step is protecting the exposed tooth and arranging replacement before decay advances.
How long can I leave a lost filling before getting it replaced?
Days to a couple of weeks is generally tolerable. Beyond that, the risk of decay progression, pulp involvement, and tooth fracture increases markedly. Teeth with lost fillings and no remaining cusp support are especially prone to fracturing under normal chewing.
Why is my tooth suddenly sensitive after a filling fell out?
Dentine tubules are now open to the mouth. Cold, sweet, and acidic stimuli move fluid within them, triggering pulp nerve endings. This is the hydrodynamic mechanism of dentine sensitivity. Covering the exposed dentine, even temporarily, usually resolves it immediately.
« Back to Glossary Index