As an adult, teeth cannot grow back after they are lost. Normal people will have two sets of teeth in their life, the first set of teeth is milk teeth, probably in the early childhood about 7 years old began to fall out naturally, after the fall out of the second set of teeth for the permanent teeth, the permanent teeth will be accompanied by a person’s whole life, permanent teeth can not grow out of the teeth, can only be as soon as possible for dental restoration. Adult tooth loss may be related to external impact, dental caries, periodontitis and so on. Adult patients after tooth loss, it is recommended to go to the regular hospital in time to check the condition of the teeth, whether there is a residual root, timely removal of residual roots and filling treatment. To prevent tooth loss, it is recommended that patients pay attention to the usual oral hygiene, such as brushing in the morning and evening, flossing correctly, rinsing after meals, etc., but also need to go to the hospital regularly for oral examination.