Amalgam is a commonly used dental material to treat and fill cavities. This has much to do with strength and durability; it is also the most inexpensive type of tooth filling compared to other options such as gold, composite or porcelain. Dental amalgam is made of an equal amount of elemental liquid mercury and an alloy powder containing silver, copper, tin and usually a small amount of zinc. However, due to an increasing emphasis on keeping smiles metal-free for health and aesthetic reasons, today fewer dentists recommend dental amalgam fillings as optimal dental treatment.
Dr. James L. Johnson