Diseases that occur in the teeth are usually better treated if they can be preserved, or better removed if they are not worth preserving or if the treatment is not effective, as described below. The preservation of natural teeth has positive significance for the health of the whole mouth and the alveolar bone. When a tooth is diseased, it can be preserved through filling treatment, root canal treatment, full crown restoration, apical surgery and so on. For severe loosening, wisdom teeth and other teeth with low retention value, as well as teeth with poor results of definitive treatment can be selected for extraction, early restorative treatment, to reduce the negative impact of the affected teeth on neighboring teeth and the surrounding hard and soft tissues. The same disease, the patient’s condition is different, the choice of treatment is different, it is recommended to go to the hospital in time to receive regular treatment.