After half of the tooth is lost, the following three methods can be used to repair: First, the more conventional is to carry out resin filling, but it is mainly applicable to more teeth left, the crown area is relatively large part of the tooth, if the tooth is missing more, with resin filling after easy to fall off. The second type of restoration can be done with porcelain or all-porcelain crowns, which can protect the tooth from fracture after the crown is placed. The third type of restoration can be done by veneers, but veneers are only suitable for front teeth that have lost a large part of their teeth, there is no way to choose veneers for restoration of back teeth, and the veneer fee is generally higher, but its biggest advantage is that the amount of teeth removed is relatively small and very minimally invasive.