Dental amalgam, a material used to fill cavities caused by tooth decay, is made by mixing a powdered alloy of silver, tin and copper with liquid mercury. The European Union already bans its use for treating children under 15 years old, as well as pregnant or breastfeeding women. New rules adopted by the European Council completely ban the use of dental amalgams for all ages starting in 2025, unless deemed strictly necessary by the dental practitioner to address the specific medical needs of a patient. In this country, the use of dental amalgam is permitted even though the U.S. Food and Drug Administration warns that exposure to mercury may pose a greater health risk to pregnant and nursing women, newborns and infants, children younger than 6 and those with neurological disease, impaired kidney function or an allergy to mercury.