Patients with TMJ dysfunction generally have a younger age of onset, and most have bad habits such as lateral chewing, night grinding, and a preference for hard foods. However, there are also a significant number of patients who do not have the above habits and simply have poor cervical posture, which can also affect the function of the TMJ. For most people who work at a desk, whether they are reading a book or looking at a computer, they are accustomed to a posture of “arching their backs and extending their heads forward”. Many people think this is more comfortable, but it is precisely this posture that damages the temporomandibular joint. When the head is stretched forward, it is usually accompanied by a mild backward tilt, which changes the position of the mandible. Normally, there are many muscles and ligaments to maintain the position of the mandible. Then, when the head is tilted back, the muscle groups that maintain the position of the mandible, such as the supraglottis and infraglottis, are strained to maintain the position of the mandible. Over time, this causes strain on the corresponding muscles and affects the function of the temporomandibular joint. Patients who visit the department, doctors usually emphasize to patients the maintenance of cervical spine and head posture. Patients should try to correct their poor posture in order to facilitate the recovery of TMJ function.