The Department of Orthodontics is a specialized department for the treatment of malocclusion in children, adolescents and adults. At present, the treatment scope of the Department of Orthodontics includes: 1) irregularities of the teeth; 2) early treatment of anti (dentition), maxillary protrusion, mandibular recession, and malocclusion; 3) orthodontic treatment before orthognathic surgery; 4) auxiliary orthodontic treatment of periodontal disease; 5) early consultation and treatment of various dental irregularities and facial development asymmetry. The application of the world’s most advanced orthodontic technology such as MBT straight wire arch orthodontic technology, differential orthodontic technology and self-ligating orthodontic technology; aligner materials are mostly imported products. The timing of orthodontic treatment has a significant impact on the effect of orthodontic treatment. Determining the best time to start orthodontic treatment depends on the type of malocclusion and the growth and development of the individual. Different timing of orthodontic treatment is chosen for different patients with malocclusion. Bony problems that affect growth and development and bad habits that prevent normal jaw and facial function need to be treated early (3-5 years of age), such as “bunions”, lip biting, finger sucking, etc. However, the best age for most orthodontic treatment is between 11-16 years old. During the early eruption of permanent teeth (8-10 years old), consultation and examination can be conducted at the orthodontist to regularly observe the eruption process of permanent teeth in order to detect and solve problems in time. The main purpose of orthodontic treatment for adults is to solve aesthetic problems while improving overall oral health conditions. Orthodontic treatment not only gives you an attractive smile, but also prevents the occurrence of diseases such as tooth decay, gum recession, bleeding, loose teeth, and early loss. This is because disorders of tooth alignment are an important cause of these diseases. Chewing pain and temporomandibular joint pain caused by occlusal disorders should be treated orthodontically.