When a tooth root is fractured after trauma, there are important factors that determine whether the tooth can be retained: 1. Is the nerve still alive? 2. Is the fractured part of the tooth root and the two fractured sections in close contact? 3, Is the tooth stable? 4.Is the root nerve and peri-root infected? These 4 points are the factors that determine whether your tooth is retained or not. If the root fracture is near or in the middle of the root, the tooth may heal after fixation if it is not prolapsed. A root fracture in the cervical region of the tooth, which can easily infect the periodontal tissue and nerve through the gingival sulcus, will not easily retain the crown. Crushed roots also do not heal easily and the tooth needs to be extracted. In response to this problem, I think we all like to know how we can repair the tooth: experts say: fixing a tooth with a fractured root is important! Because after the root is broken, the broken end may still be close together or separated and have different degrees of space; because the healing of the broken part of the root is related to the degree of closeness of the two broken ends; if the gap between the two broken ends is not large, the tooth can be fixed with a slight force in the direction of the long axis of the tooth to make it close together. If the tooth is painful during fixation, it should be promptly determined whether the tooth can be retained, and if it can be retained, the nerve should be extracted and the root canal filled, but it should be done carefully to avoid misalignment of the two broken ends. If it cannot be retained, the broken tooth should be extracted and dental restoration techniques such as crowns and simulated teeth should be done.