Nickel-chromium porcelain tooth is a type of tooth made of nickel-chromium alloy, which is corrosion-resistant, inexpensive, and is the most made porcelain tooth in China. Medical nickel-cadmium alloy is mainly composed of nickel, chromium and a small amount of metal elements that are harmless to the human body, and the adverse effects of nickel-chromium alloy on the human body are mainly caused by nickel.