The warning is not aimed at the general population, only at two groups already urged to limit mercury from another source — seafood — because too much can harm a developing brain.
The fillings, formally known as dental amalgams, "contain mercury, which may have neurotoxic effects on the nervous systems of developing children and fetuses," reads the FDA Web posting.
That doesn't mean it truly harms, and the FDA advises against removing existing fillings.
The agency still is studying whether the small amount of mercury vapor released by chewing and brushing is enough to cause neurologic disorders or other problems in youngsters. There have been only a handful of rigorous studies comparing children given either amalgam fillings or tooth-colored resin composite fillings that are mercury-free — and those studies haven't detected any brain problems.
Nor has that research settled the long-simmering scientific controversy. Two years ago, the FDA's own independent scientific advisers said that while amalgam fillings were safe for most people, more research was needed about potential effects on fetuses and children under 6.
And this spring, the FDA put dentists on notice that it is considering additional controls, including whether to require warnings that would advise consumers of the mercury in amalgams before they have a cavity filled, or perhaps even restrict use in small children and certain other patients. It is accepting public comments until July 28.
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