Full dentures usually require the removal of all the roots. Before making full dentures, it is usually recommended to extract all the residual roots in the mouth if the physical condition permits. First of all, the surface of the residual roots is uneven, which affects the modeling and making of dentures; in addition, the residual roots are also prone to recurrent inflammation, which causes periapical inflammation, and in severe cases, causes infection of the facial space, which affects the wearing of full dentures and leads to pain in mastication. It should be noted that patients who are in poor physical condition or do not want to have too many extractions can be examined by a physician and partially retained stumps can be treated with endodontic therapy first, and then a socket crown or a fine attachment can be made to retain them, but it will increase the cost. Specifically need to go to the regular hospital to ask the doctor for an interview, according to the actual situation, by the doctor after the examination to choose the best treatment plan.