The causes of TMJ disorders are not yet completely clear, but after long-term clinical research, it can be determined that TMJ disorders are related to the following factors: 1, psychological factors: including the fast-paced society now, many people are more stressed, in a state of anxiety or depression, this kind of people are prone to this disease; 2, occlusal factors: uneven teeth, missing teeth, wisdom teeth eruption, these conditions may lead to occlusion problems, and slowly lead to the occurrence of TMJ disorders; 3, bad habits: some people always like to use one side to chew, and some people always like to bite hard. These conditions may lead to occlusion problems, and slowly lead to TMJ disorders; 3, bad habits: some people always like to use one side to chew, some people always like to bite hard objects, such as some people in Hunan like to chew betel nut, and some young people like to chew gum, these bad habits over time, may also lead to TMJ disorders; 4, teeth grinding disease Some people sleep at night with their teeth clacking, and long-term grinding is not treated in time, which may also lead to TMJ disorder; 5, environmental factors: such as the weather suddenly becomes cold, the incidence of patients will be significantly higher; or in the summer, although the weather is very hot, but if the long-term blowing air conditioning or fan against the joint, may also suffer from this disease.