Are old-style dental fillings still raising blood mercury in adults?
Yes. Peer-reviewed research confirms that dental amalgams are a source of mercury exposure that increases levels in your blood.
What's actually in it
Old-style dental fillings, often called dental amalgams, are made of a mixture of metals that includes mercury. These fillings aren't just sitting in your teeth doing nothing. They can release mercury into your body over time.
When you have these fillings, you are exposed to mercury, a heavy metal that accumulates in your system. This isn't a theory. It is a documented source of internal exposure that shows up in your blood tests.
What the research says
A 2026 study in Clin Chem Lab Med found a clear link between dental amalgams and higher mercury concentrations in the blood of American adults. This peer-reviewed study confirms that the more of these fillings you have, the more mercury is present in your blood.
Other research highlights the risks of having mercury in the blood, especially for vulnerable groups. A 2026 study in Biol Trace Elem Res looked at the effects of mercury and other heavy metals during pregnancy. It found that these substances are present in cord blood, which shows how these metals can move through the body and impact health.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Dental amalgams and blood mercury concentrations in American adults. | Clin Chem Lab Med | 2026 |
| Association Between Hypochromic Microcytic Anemia in Pregnancy and Cord Blood Levels of Cadmium, Lead, Manganese, Mercury, and Selenium. | Biol Trace Elem Res | 2026 |
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