Major dental authorities, including the Australian Dental Association, consider dental amalgam a safe and durable filling material for most people. Silver coloured amalgam fillings have been used for well over a century, and the mercury they contain is bound within a stable alloy. For most patients an intact amalgam filling releases only very small amounts of mercury vapour, within recognised safety limits. There are sensible exceptions and reasons some people choose alternatives, which are worth understanding clearly.
Key takeaways
- Amalgam is regarded as a safe and effective filling material by major dental bodies.
- The mercury in amalgam is bound in an alloy; an intact filling releases very little vapour.
- There is no evidence that removing sound amalgam fillings improves general health.
- Removing intact fillings unnecessarily wastes tooth structure and can release more vapour.
- Alternatives like tooth coloured composite are available and may be preferred for some patients.
What amalgam is
Dental amalgam is a mix of metals, including silver, tin, copper, and mercury, that sets into a hard, long lasting filling. It has been valued for decades because it is strong, wears well, and copes with heavy chewing forces on back teeth. Its main drawback for many people today is simply its silver colour, which is why tooth coloured materials have become more popular. Our guide comparing white and silver fillings looks at the trade offs.
The mercury question
The concern people raise is the mercury content. The key point is that the mercury is chemically bound within the set alloy rather than free. An intact filling releases only tiny amounts of vapour, and studies consistently find these levels sit within safety limits for the general population. Health authorities have reviewed the evidence repeatedly and continue to regard amalgam as safe for most patients. This is why routine amalgam use remains permitted, alongside a gradual move toward alternatives for environmental and aesthetic reasons.
Should you replace old amalgam fillings?
This is the most common question, and the evidence based answer is reassuring. There is no evidence that replacing sound, intact amalgam fillings with other materials produces a better health outcome. In fact, drilling out a filling that is doing its job removes healthy tooth structure and can briefly release more mercury vapour than leaving it alone. For that reason, dentists generally recommend replacing an amalgam filling only when there is a clinical reason, such as decay around it, a crack, or the filling wearing out.
| Situation | General guidance |
|---|---|
| Intact, sound amalgam filling | Usually best left in place |
| Decay or a crack around it | Replace for a clinical reason |
| Filling worn or leaking | Replace as part of normal care |
| Cosmetic preference | A personal choice to discuss, with pros and cons explained |
Who might choose alternatives
Some groups may be advised to favour alternative materials such as composite resin, including pregnant women, people who are breastfeeding, young children, and those with a known allergy to a component of amalgam. Many people also simply prefer a tooth coloured result. Composite has improved greatly and is a strong choice for most everyday fillings. If you would like a new filling to be tooth coloured, or you are due to replace one for a clinical reason, discuss the options with your dentist. Our guide on getting a filling explains the process.
Frequently asked questions
Are amalgam fillings dangerous?
Major dental authorities consider them safe for most people. The mercury is bound in the alloy and an intact filling releases very little vapour.
Should I have my amalgam fillings removed?
Not without a clinical reason. There is no evidence that removing sound fillings improves health, and it removes healthy tooth.
Why are dentists using amalgam less?
Mainly for appearance and environmental reasons, not because intact fillings are considered unsafe. Tooth coloured materials have also improved.
Is it safe to get an amalgam filling while pregnant?
Alternatives are often preferred during pregnancy and breastfeeding. Tell your dentist so the right material can be chosen.
Do amalgam fillings cause health problems?
Reviews of the evidence have not shown that intact amalgam fillings cause general health problems in most people. Discuss any specific concerns with your dentist.
Have questions about your fillings?
If you are unsure about existing fillings or want a tooth coloured option next time, the team at Lumi Dental can talk you through the choices without pressure. See current options on our offers page.
This article is general information and is not a substitute for personal dental advice.
