Orthodontics includes a wide range, which usually refers to the treatment process of correcting teeth with irregular arrangement, abnormal tooth shape and abnormal tooth color through oral technical means.

According to different diseases, the clinical manifestations are different, and their similarity is that they have a negative impact on appearance. The irregular arrangement of teeth is manifested as in-and-out teeth, overlapping teeth and so on. , making it difficult to clean teeth and prone to dental diseases. Abnormal tooth morphology is characterized by incomplete teeth, which is not commensurate with adjacent teeth and affects chewing and image. The most common tooth color abnormalities are dental fluorosis and tetracycline teeth.

Most teeth that need to be corrected have typical clinical manifestations, and clinical diagnosis is not difficult. The diagnosis can be made by clinical examination and medical history.