The treatment for inability to bite is mainly periodontal treatment, root canal treatment or the need for tooth extraction. The inability to bite may be caused by acute or chronic periapical inflammation, fracture of the tooth root, or loose teeth caused by advanced periodontal disease. The symptoms of periapical periodontitis are mainly discomfort from biting hard objects and paroxysmal throbbing pain during the acute attack, which requires root canal treatment to eliminate the periapical inflammation. In most cases, the tooth needs to be extracted if it is afraid to bite due to the fracture of the root. Periodontitis causes the resorption of the alveolar bone and the gradual exposure of the root, and when the root is exposed to a certain extent, it will cause the tooth to loosen and not be able to bite, and then periodontal treatment is needed.