Proposed EPA rule would require dentists to prevent mercury, toxic metals from going down the drain

Introduced by French dentists who immigrated to the U.S. in 1833, the use of amalgam as a dental restoration material became popular as blacksmiths, barbers and tradesman easily made it from the fillings of silver coins and other metals. Adding liquid mercury helped to amalgamate the mixture of metals, resulting in a plug soft enough to apply to a decaying tooth.

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