Teeth that are active do not necessarily need to be extracted. Because of tooth movement, it is possible that the tooth is loose due to a purulent inflammation in the root tip of the tooth, which will then produce a loose tooth. This kind of tooth loosening can be treated with root canal treatment of the tooth, and after the inflammation is eliminated, the tooth looseness will be reduced or even not loosened, so that extraction is not necessary. In addition, if there is heavy inflammation of periodontium and gum, the periodontal pocket is deeper and there is some resorption of alveolar bone, the tooth may also become loose. If the tooth is not too loose, the tooth can be fixed. After the fixation, if the alveolar bone continues to resorb and cannot be retrieved, then extraction treatment will be performed.