Porcelain teeth, that is, porcelain fused to metal full crown is also known as metal-ceramic crown (metal-ceramic crown). It is porcelain powder after high temperature sintering fused to the surface of the metal crown and the formation of full crown restorations. Metal ceramic crown is currently the most clinically used full crown restorations, both cast metal crowns with good mechanical strength and all-ceramic crowns aesthetic advantages, is a more ideal restoration. Mainly used for the treatment of dental defects, dental defects and other fixed restorations. According to the different metal substrate materials are divided into nickel-chromium alloy porcelain crowns, cobalt-chromium alloy porcelain crowns, gold-palladium alloy porcelain crowns, gold-platinum alloy porcelain crowns, and so on, the performance of its material determines the characteristics of the crown itself. However, the majority of patients are often keen to compare the price of porcelain teeth in various medical institutions, while ignoring the classification of its materials. I often hear patients complain in the clinic, “your hospital’s porcelain teeth how so expensive, which which of the porcelain teeth as long as a small amount of money”. Porcelain teeth is not a commodity, is a medical device used to treat patients, ordinary patients can not identify the type of material, poor quality porcelain teeth not only can not achieve the purpose of treatment, on the contrary, it will jeopardize the health of the body, inducing a variety of systemic diseases. First of all, poor quality porcelain teeth may contain beryllium and other harmful substances, and secondly, poor quality materials in the moist oral cavity will oxidize and degrade, the formation of harmful substances, irritate the gums, induce allergies, damage to the liver and kidneys and so on. Finally, it is recommended that the majority of friends in the oral cavity before the porcelain tooth repair must ask what material, what are the advantages and disadvantages, pay attention to the professional qualities of the physician, how not to price points high and low, porcelain teeth is not just a simple set of the affected teeth, high-quality ceramic teeth also need to be excellent preparation of the dentition.