Fillings can last years, but they do not last forever
The lifespan of a filling depends on the size of the filling, where it is located, how much biting pressure that tooth receives, and how well the surrounding tooth structure holds up over time. Small fillings in lower-stress areas often last differently than large fillings in teeth that do most of the chewing.
A filling also ages alongside the tooth itself, which means the surrounding tooth structure matters just as much as the material.
Signs a filling may be failing
New sensitivity, rough edges, a crack line, pain when chewing, food trapping, or a feeling that the bite is suddenly off can all be reasons to have a filling checked. Not every symptom means the filling is failing, but it does mean the tooth deserves a closer look.
Why earlier repair can help
Catching a weakening filling early may give you more conservative options than waiting until the tooth needs a crown or root canal. A simple evaluation can often clarify whether monitoring, replacement, or a larger restoration makes the most sense.