Frequent dislocation of the jaw after braces are removed may be caused by laxity of joint ligaments, hyperfunction of extra-pterygoid muscles or old injuries, and it is recommended to go to the hospital for examination and treatment in time. Braces removed jaw often dislocated may be due to temporomandibular joint disorders, in the orthodontic process to move the position of the teeth, the joints will be affected to a certain extent, if the patient himself joint ligament laxity will be easy in the orthodontic joint capsule loosening, especially in the large open mouth is particularly easy to dislocate. Long-term hyperfunction of extrapterygoid muscles will make the temporomandibular joints move too much, which will lead to laxity of joint ligaments, and dislocation will occur frequently. Prompt repositioning is generally recommended, and if necessary, a hospital visit is necessary to examine and formulate a treatment plan.