A large tooth lost half from the side can be filled, but if there are more defects, the direct filling may not last long, but also need to consider doing crown treatment. 1. Small defective parts: big teeth from the side of the half lost, if the defective parts are small, can be prepared around the cavity type, the use of resin to fill it, if the cavity type is well prepared and bonding treatment is good, in the oral cavity to maintain the time is generally longer. 2. Large defective part: half of the large tooth is lost from the side, if the defective part is large, the resistance and retention of the tooth is not as good as the small defective part, the direct use of resin filling may only be able to maintain for a period of time, it is recommended to make crowns in the outer layer or consider making inlays to restore the shape of the tooth. A large tooth that has lost half of its side can usually be filled, but the specific situation depends on the location and size of the defect, and it is recommended to go to the hospital in time.