Modern Yongkang oral-bracket-free invisible orthodontic technology can be customized according to the maxillofacial morphology of each patient, and each pair of appliances produced after tooth movement can be simulated by computer three-dimensional image technology. After wearing it, the teeth will feel stressed and move to the position where the appliance is designed. Invisible correction, let crooked teeth stand up quietly? Convenient and quick to shorten the course of treatment: generally, replace a pair of appliances every two weeks, and the teeth will gradually move from the initial deformed state to the normal arrangement state. The length of correction depends on the severity of the patient's tooth deformity, which usually takes about six months to one year. As for the question of tooth extraction and wisdom teeth, my friend upstairs answered correctly.