Bony mouth protrusion is mainly judged by facial shape and cranial X-ray data. 1. Facial shape: Bone mouth convexity is commonly caused by bony heredity and adolescent bad habits, the mouth protrudes outward, and also can not be closed naturally, the teeth can not be closed state. The teeth cannot close naturally and the teeth are not able to close. This causes the side of the face to protrude, and the mouth and the facial features appear to be incongruous. Bony mouth protrusion is slightly more difficult to correct, and it may be treated with surgery. 2. Cranial X-ray: Bone mouth protrusion can be measured by cranial lateral X-ray, ANB angle (indicating the relative anterior and posterior positions of the maxilla and mandible) is greater than five degrees, the relationship between the back teeth is mostly far from the middle jaw, common maxillary protrusion, mandibular retraction and maxillary protrusion combined with mandibular retraction, or both jaws appear to protrude significantly, can be determined to be a bony problem. The treatment of bony mouth protrusion is a slow process, taking into account both the aesthetic and occlusal function of the teeth, as well as the bony contraction changes, which is relatively complicated.