FDA rules on dental amalgams

The U.S. Food and Drug Administration said silver-colored dental fillings that contain mercury are safe for patients, reversing an earlier caution against their use in certain patients, including pregnant women and children.

"While elemental mercury has been associated with adverse health effects at high exposures, the levels released by dental amalgam fillings are not high enough to cause harm in patients," the FDA said, citing an agency review of roughly 200 scientific studies.

Still, in final regulations issued as part of an earlier legal settlement, it said the fillings were now considered "moderate risk" devices and will include details about the risks and benefits of the products. They will also carry warnings against their use in patients with mercury allergies or in poorly ventilated areas.

Steve - part of the problem is that there is the unknown of how heavy metals affect health at chronic low-level exposure over a lifetime. None of the data the FDA considered contains studies of this nature.