Large teeth that is, molar teeth, molar teeth can be restorative treatment should be retained as much as possible, can not be restorative treatment or retention value is not high can be extracted, followed by prosthetic restoration, specific as follows. 1. Molar teeth can be restored: after root canal treatment of molar teeth, if the length of the root is enough, it is feasible to repair the crown, which is favorable to the preservation of periodontium and alveolar bone around the molar teeth. 2. Molar teeth can not be restored or retained value is not high: the remaining tooth tissue of the molar teeth can not provide sufficient retention and resistance for full crowns or pitted crown restorations, so it is not possible to carry out full crowns or pitted crown restorations, or the degree of looseness of the molar teeth is large, and it can not be improved through periodontal treatment, so it is not high value for retaining the molar teeth can be extracted, and after that, it is possible to carry out prosthetic restorations, so that the appearance and function can be restored. It is recommended to go to a regular medical institution to receive professional treatment.