Bridge means the middle is missing teeth, through the teeth on both sides of the denture fixed in that position, like a bridge structure device is called a bridge, commonly known as a bridge. Porcelain means the material of the bridge, inside is a metal liner, outside is porcelain powder, fixed on the teeth on both sides, called porcelain fixed bridge. When the patient is missing teeth in the middle, that is, both sides of the missing teeth, in order to build a bridge. The teeth on both sides are equivalent to two piers, and then the porcelain bridge is fixed in that position to repair the missing tooth. Very strong teeth on both sides are required.