Can dental amalgam fillings raise mercury levels in your blood?
Yes. Adults with dental amalgam fillings had higher blood mercury levels, with more fillings meaning more mercury.
What's actually in it
Dental amalgam fillings are made from a mixture of mercury (about 50%), silver, tin, and copper. Once in your tooth, the filling slowly releases mercury vapor that you breathe in and absorb. Chewing, grinding, and hot drinks all increase the release rate.
The Minamata Convention aims to phase down dental amalgam use worldwide due to mercury's toxicity.
What the research says
A 2026 study in Clin Chem Lab Med analyzed data from American adults and found people with amalgam fillings had higher blood mercury than those without. The relationship was dose-dependent: more fillings meant higher mercury.
Mercury is a potent neurotoxin. Even at low levels, it affects memory, concentration, and nervous system function. The study confirmed dental amalgams are a meaningful source of ongoing mercury exposure for millions of people.
If you need new fillings, composite resin or ceramic alternatives contain no mercury. For existing amalgams, safe removal by a trained dentist using proper containment protocols eliminates the exposure.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Dental amalgams and blood mercury concentrations in American adults. | Clin Chem Lab Med | 2026 |
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