When it comes to precious metal porcelain teeth, we have to mention gold, gold for teeth is not because it is gold is very valuable, but the stability of its own performance determines its important position in oral restoration. Gold is the best biocompatible metal, is also the first metal used for porcelain teeth, does not react with human tissue, there is no gum inflammation, cervical edge blackening, metal odor and other problems. Gold color and dentin color (the color of the inner layer of the tooth) close, so that porcelain teeth look more realistic and beautiful (normal teeth outside the enamel layer of transparency similar to the porcelain layer of porcelain teeth, enamel under the dentin is light yellow, the color of gold is also light yellow and other metal crowns for black), so there will be no other metal porcelain teeth night light environment porcelain teeth greening problem. The ductility of gold is very good, so in all porcelain teeth gold porcelain teeth (especially gold deposited porcelain teeth) is the best fit, and the fit is the first criterion for judging the quality of porcelain teeth. Gold is soft, high purity gold is mostly used for single crown restoration, for the restoration of missing teeth, increased hardness, adding other components of the metal, such as palladium, so that it can be used for the restoration of a few missing teeth. The disadvantage of gold porcelain teeth is expensive, so whether the doctor or technician pay extra attention to this, the factory to do gold porcelain teeth are high-level technicians, which also ensures the high quality of porcelain teeth. Also, gold porcelain teeth are not X-ray, magnetic, can not do MRI, will affect the future medical examination.