Adult teeth usually do not grow back after they fall out. 1. Human teeth are divided into milk teeth and permanent teeth, milk teeth will basically be lost in early childhood, after which permanent teeth will grow, and permanent teeth will accompany people throughout their lives; adult teeth are basically all permanent teeth, and if they fall out due to certain reasons, basically they will not grow out again. 2. Adult tooth loss is generally related to tooth decay, periodontitis or external impact, etc. Once the teeth fall out, it is recommended to actively go to the relevant departments of regular hospitals to clarify the cause, follow the doctor’s advice to adopt the appropriate treatment program, and if necessary, can also be fixed denture or dental implants, etc. for restoration. It is recommended to do a good job of oral hygiene, diligent brushing and rinsing, which is conducive to reducing the incidence of oral diseases, if there are symptoms of physical discomfort, you should go to the hospital in a timely manner, after consulting the physician for treatment.