Tooth cosmetic repair is a comprehensive subject. The common subjects are: beautiful crown repair, porcelain veneer cosmetic repair, orthodontic correction, tooth whitening. Tooth beauty mainly affects the beauty of the face by changing the shape, color and quality of the teeth. 1. The influence of tooth shape: "Teeth are three parts of beauty". The overall shape influences such as dentition crowding, tooth space, and anti jaw; Individual tooth shape effects, such as dental caries and tooth trauma, can cause tooth shape defects, deformed teeth, tooth torsion, and tooth loss, which can affect facial beauty. 2. Influence of color: such as caries, dead pulp teeth, dental fluorosis, tetracycline teeth, unclean yellow teeth, etc., all can affect facial beauty. 3. Qualitative impact: if teeth are missing, especially canines, it can lead to the loss of facial structure, the collapse of facial soft tissue, the increase of skin wrinkles, and the aging of facial appearance. Caries - toothache (or missing teeth on one side) - unilateral mastication habit - hypertrophy of masticatory muscles on one side, asymmetric facial development, giving the impression that the mouth is crooked and the jaw is not straight.