It is neither possible nor desirable to extract incisors with cosmetic dentistry, because our incisors assume a very important function in our mouth. In addition to what we often think of as cutting, the incisors also assume a very important aesthetic and pronunciation functions, if the incisors are missing, it will have a very big impact on the patient’s aesthetics as well as pronunciation, so straightening the teeth is not possible to extract the incisors. Generally speaking, we professionally call it orthodontics, which is a kind of operation by wearing orthodontic arch wire to make our irregular teeth as neat as possible and make our face as beautiful as possible. Since the amount of teeth is relatively high nowadays, in order to achieve a more beautiful effect, many people need to extract a part of the teeth and then straighten them. Generally speaking, the teeth extracted before orthodontic treatment are premolar teeth, that is, the fourth or fifth teeth, and the decision of which tooth should be extracted should be made by a professional orthodontist.