Many theories have been developed about the origin of complaints in the chewing system. However, no specific cause can be identified. Sometimes complaints arise from incorrect loading, incorrect use (grinding or clenching) or from overload (chewing gum). Positional abnormalities of the lower and upper jaw, teeth and molars can also lead to CMD. In addition to the above examples, stress, incorrect tongue-swallowing behavior and incorrect posture/position of the neck can also be considered, but it can also be based on having incorrect habits such as grinding teeth, clenching, biting nails. Especially incorrect Mouth opening and closing patterns are an important cause and even if many molars are missing, this can lead to overload of the jaw joint. With an incorrect opening pattern, when the jaw shifts forward too early and does not rotate first, the jaw head takes the disc that lies in the joint forward too quickly, causing secondary pain in, among other things, the posterior part of the temporomandibular joint capsule, with resulting in radiating pain, trigger points, blocking and popping jaw joints, etc. Furthermore, diseases such as joint rheumatism or psychological tension can cause complaints. [see also MyoFeedback] Nowadays it is assumed that there is a complex of factors that cause CMD complaints. Diagnosis and treatment The diagnosis of CMD is usually made by your GP or dentist. If it is decided in consultation with you that treatment or further examination is necessary, you will be referred to the physiotherapist who specializes in jaw function disorders. Sometimes, however, you go to the ENT doctor with ear complaints, or to the neurologist with headache complaints. If desired, these specialists will refer you to a physiotherapist who treats specific jaw problems. What does the jaw physiotherapist do?