Should Old Metal Fillings Be Replaced?
Short answer
Old metal fillings, including amalgam or silver fillings, do not usually need to be replaced just because they are old. If the filling is still intact and the tooth is doing well, dentists often monitor it rather than remove it.
What matters most is the condition of the tooth and the filling today, not the filling’s age alone.
What dentists look for at the exam
When we check an older filling, we look for signs that it may no longer be protecting the tooth well. Common reasons to re-check a filling include:
- new decay around or under the filling
- a crack in the filling or the tooth
- edge breakdown or a visible gap
- wear that has changed the bite
- sensitivity, pain, or food catching around the area
- a filling that feels rough, loose, or broken
- loss of tooth structure that makes the restoration less dependable
Those findings, along with your symptoms, help guide the next step.
Monitor, repair, or replace
Not every problem needs a full replacement. If a defect is small, a dentist may be able to monitor it or repair part of the restoration. If the filling has larger breakdown, recurrent decay, or symptoms, replacement may be the better option.
The usual goal is the least invasive treatment that still protects the tooth. That is why two fillings that look similar from the outside may need different plans after an exam and, sometimes, X-rays.
Safety context in Canada
Canadian guidance is reassuring: the Canadian Dental Association, Health Canada, and Ontario’s dental regulator do not recommend removing sound amalgam fillings just because they contain mercury. Available reviews have not shown a clear systemic-health reason to remove a sound amalgam filling for safety concerns alone.
That does not mean every old filling should stay forever. It means removal should be based on a real dental reason, not on age, colour, or mercury content alone.
If you prefer to talk through material choices and the whole-person side of care, our dentistry page explains how we approach those conversations.
When to book a visit
It is worth booking an exam if an older filling is sensitive, painful, chipped, catching food, visibly open at the edge, or feeling loose. Those are the kinds of changes that can shift the plan from monitoring to repair or replacement.
Hamilton next step
If an old filling has been on your mind, a calm exam can help sort out whether it still looks sound or whether a smaller repair may be possible. If you are in Hamilton and want a second look, you can book a visit with Excel Dental to review your options.
Key sources
- Canadian Dental Association — Amalgam Position Statement
- Royal College of Dental Surgeons of Ontario — Dental Amalgams
- PubMed-indexed Review — Repair vs Replacement of Restorations
This article is for general education only and does not replace personalized advice, diagnosis, or treatment from a licensed dentist.
