Patients are advised to always ask dental professionals about the restorative material that is being used for their procedure. Patients are also advised that dental amalgam– the metallic mixture that many dentists use to fill cavities and perform other restorative procedures– is mixed with up to 60% liquid mercury. And while the American Dental Association has not formally banned the practice, other health organizations around the world have called for the official “phase-out” of the potentially toxic material. In the United States, New York University College of Dentistry became one of the first major names to denounce the material, banning its use in university clinics while removing it from all curricula.