Temporomandibular joint disorder (TMD) is the most common of all temporomandibular joint disorders and is most prevalent in young and middle-aged people, with the highest prevalence in the 20s and 30s. TMD does not refer to a single disease, but is a general term for a group of joint disorders with similar clinical symptoms. The etiology of the disease is still unclear, but it may be related to the following factors: 1, mental stress, fatigue and other psychological factors; 2, occlusal factors, including occlusal interference, most missing back teeth, excessive tooth wear, misaligned eruption of wisdom teeth, etc.; 3, autoimmune factors; 4, excessive joint loading, such as long-term high melon seeds, chewing gum, etc. TMD mainly has the following clinical symptoms: 1. abnormal jaw movement: over or under opening, skewed opening, joint strangulation, etc.; 2. pain: there may be pain in the joint area and surrounding muscle pain; 3. popping and murmuring; 4. headache; 5. ear stuffiness, hearing loss, tinnitus, etc. The disease occurs in adolescents, and the duration of the disease is usually long, up to several years or a dozen years, and often recurrent, but the disease is self-limiting, generally does not occur joint ankylosis, the prognosis is good. Treatment is based on conservative therapies such as physical therapy and closure, while arthroscopic surgery or surgery is feasible in severe cases. A survey of the general population found that more than 90% of people have joint disease, but it is not necessarily the case that abnormal MRI results show symptoms of joint disease, and no treatment is needed.