For generations, dentists placed silver-colored fillings in millions of teeth. But behind their familiar appearance lies a controversial ingredient: mercury. Now that Europe has largely phased them out, Americans are asking an uncomfortable question—why are they still permitted in the United States?

so-called silver fillings are approximately 50% mercury by weight.

Yes, mercury—the same toxic metal that health authorities have worked for decades to reduce in the environment.

The presence of mercury does not automatically mean a dental filling is dangerous. Its chemical form, the amount released, and the level of exposure all matter. Nevertheless, growing environmental concerns, evolving dental technology, and questions about long-term exposure have pushed governments toward different regulatory approaches.

And in 2026, the contrast between Europe and the United States is particularly striking.
What Exactly Are Those Old Silver Fillings Made Of?

Despite their name, silver fillings are