Dental and maxillofacial malformations mainly refer to abnormalities in the volume and shape of the jaws, the relationship between the upper and lower jaws and other bones of the craniofacial skeleton, and the consequent abnormalities in the relationship between the upper and lower jaws and other bones of the craniofacial skeleton, as well as abnormalities in the functioning of the oral and maxillary systems, and the appearance of which manifests itself as abnormalities of the jaws and the facial shape. Dental and maxillofacial anomalies are growth malformations caused by congenital factors such as heredity and abnormal embryonic development, or acquired factors such as metabolic and endocrine disorders, bad habits, injuries and infections, or a combination of the two, during the individual’s craniomaxillofacial growth and development. About 40% or more of the population has malocclusion, of which about 5% is a bony malocclusion caused by abnormal jaw development, i.e., dentofacial malocclusion. Malocclusion is one of the most important clinical manifestations of maxillofacial deformity, but malocclusion is far from reflecting and representing the basic lesion characteristics of maxillofacial deformity. Patients with osseous dentofacial malformations often have abnormalities in the three-dimensional spatial relationships between the maxilla and mandible, as well as their relationships with other bones in the craniofacial region and the occlusal relationship. Common developmental deformities of the jaws include two main categories, overdevelopment and underdevelopment, and can occur in the maxilla and mandible alone or simultaneously. The deformities can be symmetrical or asymmetrical. For the treatment of dental and maxillofacial deformities, it is more complicated. It is more difficult to correct than dental, such as in the growth period, growth improvement can be given to improve or correct the skeletal malocclusion by stimulating or inhibiting the growth of the jaws, such as functional braces, anterior retractors, etc.; such as in adulthood, for the less serious deformities can be treated by orthodontic masking treatment, which is to improve the occlusal relationship through tooth movement to disguise the skeletal deformities; severe bony malocclusion, i.e., dentofacial deformities, need to be treated with combined orthomandibular and orthodontic treatments The combination of orthodontic treatment is needed to restore the occlusal relationship on the one hand and to improve the facial appearance on the other hand. Orthognathic orthodontic procedures and steps: 1, preoperative orthodontic treatment: the purpose is to align the upper and lower dental arches, coordinate the upper and lower dental arches, and remove the compensatory tilt of the teeth. 2.Determine the surgical plan: after the end of preoperative orthodontic treatment, the original surgical plan needs to be evaluated and predicted. 3.Completing the preoperative preparation: additional explanations are given to the patient about the guide boards needed for surgery and anesthesia, the surgical plan, the predicted results and the possible problems. 4.Orthognathic surgery: the surgery must be performed strictly according to the surgical design that has been predicted and re-determined before surgery. Postoperative orthodontic and rehabilitation treatment: fine adjustment of occlusal relationship, stabilization and consolidation of the effect after surgical correction. Postoperative orthodontic treatment can be carried out 3 months after orthognathic surgery. 6. Follow-up observation: Postoperative follow-up observation should last at least 6 months.