The correct term for the hook should be temporomandibular joint, temporomandibular joint pain can not open the mouth can be improved by closed treatment, manipulation and repositioning, arthrocentric lavage and other improvement of mouth opening restriction, as follows. 1. Closure therapy: the mouth opening restriction caused by masticatory muscle spasm can be closed with 2% lidocaine 2~3ml pterygopterygoid muscle, once a day or every other day, 5 times for a course of treatment, pain and mouth opening restriction can be relieved to a certain extent. 2. Manipulation and repositioning: For restricted mouth opening caused by irreversible anterior displacement of the disk, 2 ml of 2% lidocaine can be injected into the joint cavity and then repositioned by manipulation, and the degree of mouth opening can be restored to normal. 3. Arthrocentesis: If the mouth opening is restricted due to synovial membrane or joint capsule inflammation, applying arthrocentesis and repeated rinsing with saline can increase the degree of opening. If the TMJ pain is severe, it is recommended to go to the hospital in time.