The temporomandibular joint (TMJ) is a joint structure located in front of the ear, in front of the ear screen, which can move with the opening of the mouth. The TMJ allows the jawbone to move flexibly, allowing for opening and closing of the mouth, chewing, and other movements. Temporomandibular joint disorder is often the result of an abnormal bite relationship, and requires a visit to the dentist to correct the abnormal bite relationship. Symptoms of temporomandibular joint disorder include a popping sound in the ear when opening and closing the mouth, and swelling and discomfort in the temporomandibular joint. In acute inflammation, there is limited opening of the mouth, and the TMJ is swollen and painful when the jaw is moved. During acute inflammation, avoid biting hard objects, and do physical therapy, hot compresses, or anti-inflammatory treatments. Frequent inflammation of the temporomandibular joint requires correction of the occlusal relationship, and long-acting hormonal drugs can also be injected into the joint cavity.