There are many types of dental deformities or defects, which vary in size. Orthodontics can be simple or complex. For example, large deformities include jawbone malformations such as protruding upper and lower jaws, mandibular prognathism, crossbite, open bite, micrognathia, etc. Dental deformities or defects include abnormalities in tooth shape and size, such as small teeth, conical teeth, enamel hypoplasia, anomalous teeth, crown damage or fractures caused by various reasons, etc. (Suzhou Dongwu Stomatology Department). Tooth color abnormalities include tetracycline-stained teeth, fluorosis, discolored teeth, etc. Tooth arrangement abnormalities include crowded teeth, spaced teeth, misplaced teeth, etc. Abnormal tooth angles include twisted teeth, tilted teeth, etc. Tooth deficiencies include missing front or back teeth, etc. We can say that all these conditions require treatment because most of them not only affect appearance but also impair normal function. In dental treatment, aesthetic factors are involved or the treatment itself objectively plays a beautifying role. Restoring the shape, function, and aesthetics of teeth or dentures is a general principle of dental treatment. Therefore, dental aesthetics is not simply about beautification; it also involves or integrates the restoration of physiological functions.