Dental amalgams contain mercury, which may have neurotoxic effects on the nervous systems of developing children and fetuses. When amalgam fillings are placed in teeth or removed from teeth, they release mercury vapor. Mercury vapor is also released during chewing. FDA's rulemaking (described in question 7) will examine evidence concerning whether release of mercury vapor can cause health problems, including neurological disorders, in children and fetuses.

Since the 1990s, FDA and other government agencies (CDC, NIH) have reviewed the scientific literature looking for links between dental amalgams and health problems. In September 2006, an advisory panel to the FDA reviewed FDA's research and heard presentations from the public about the benefits and risks of mercury and amalgam.