Porcelain teeth do not cause cancer. Porcelain is a full-crown restoration, usually used when the tooth is relatively large defects. It has 2 layers, the inner layer is the metal layer, the outer layer is the porcelain layer, the inner metal layer can have a variety of materials, common cobalt-chromium metal, or palladium-silver metal, palladium metal, are safe and harmless, no toxic side effects on the human body, no adverse effects. Many years ago there is a metal called nickel-chromium, reported allergies, nickel-chromium metal has been eliminated, now use are safer and harmless metal such as cobalt-chromium. If you have doubts about metal porcelain crowns, you can also choose a completely metal-free all-porcelain crown restoration. All-porcelain crown restoration color is more realistic, biocompatibility is better, no metal at all, also does not affect the MRI, can be preferred.