Gold Some dentists feel that gold is the best dental material. Dental materials are never made from pure gold. They are always mixed with other metals, some of which may be toxic or allergenic. Gold can be used for large cavities and lasts many years. It lasts as long or longer than mercury.
Gold is very expensive.
Some dentists feel that gold is too hard and not good for the tooth. These are a new type of dental material. Don't be fooled by the name. There are many materials used in composites. Ordinary composites are hardened in the mouth.