Diastema, also known as retrognathism, is a condition in which the upper front teeth bite in front of the lower front teeth during normal occlusion and the lower front teeth bite in front of the upper front teeth during retrognathism. At present, the surgery of the enameled jaw has become more mature, but any surgery will have certain risks, specifically the following points: 1, infection: any surgery will have the possibility of infection, especially the choice of intraoral incision, due to feeding and other reasons will increase the possibility of infection, so patients should pay attention to the application of antibiotics for 5-7 days after surgery; 2, maxillary and mandibular fractures: in the application of osteotomes to remove the harder bone tissue, if the operator is too hard, if the operator is too hard, the patient will not be able to get the fracture. 3. bleeding and postoperative hematoma: if there is more bleeding during osteotomy, it may lead to bruise formation; 4. bilateral asymmetry: in the process of osteotomy, it may cause asymmetric removal of bilateral bone; 5. unsatisfactory results: there is a possibility that more bone tissue may be osteotomized during surgery, resulting in other types of deformities; 6. 5, unsatisfactory results: the surgery may cause more bone tissue to be removed, resulting in other types of deformities; it may also be too little to achieve the desired corrective effect; 6, nerve damage: in the process of surgical stripping layer by layer, it may cause nerve damage; 7, poor bone healing, or functional problems such as difficulty in opening the mouth.