Amalgam restorations - better known as “silver fillings” are one of the most widely used materials to fill cavities in decayed teeth. It has been used for 150 years; only gold has been used longer. The use of dental amalgams or “silver’ fillings in dentistry is an extremely controversial topic. Amalgam restorations, or silver fillings, consist of mercury, silver, tin, copper, and traces of zinc. Based upon 1995 manufacturers specifications amalgams typically contain 50% metallic mercury, 35% silver, 9% tin, 6% copper, and traces of zinc.