Etiology 1. Anatomically, the temporomandibular joint can be dislocated without any external force. 2, temporomandibular joint disorder based on large open mouth, temporomandibular joint dislocation. Zhang Bing, Department of Oral and Maxillofacial Surgery, Harbin Medical University Stomatological Hospital Treatment: 1. Manipulation reset. 2. Restriction of jaw movement: cranial cross bandage fixation for 3 weeks. The opening should not exceed 1 cm. Dislocation will often occur in the future if it does not reply well the first time. Prevention i.e. avoid large mouth opening, and additionally treat the cause of temporomandibular joint disorder.