Dental hook is the temporomandibular joint, temporomandibular joint dislocation has temporomandibular joint dislocation and temporomandibular joint disorders, the former can be reset by manipulation, and the latter reset requires surgical treatment. 1. Temporomandibular joint dislocation: acute anterior dislocation is common, which occurs when laughing or yawning, and the mouth can not be closed, so it is necessary to go to the hospital for reset, and reset the anteriorly displaced condyle back to the normal position. 2. Temporomandibular joint disorder: mainly manifested as opening and closing the mouth popping, mainly caused by the displacement of the joint disk, the need for joint magnetic resonance examination to clarify the minor, the symptoms of the minor generally do not need to be dealt with; when the impact of eating, opening the mouth when the symptoms of restriction can be considered for surgical treatment for the restoration of the displaced joint disk reset to the normal position. It is recommended to go to a regular hospital stomatology department for consultation.