In elderly people with tooth stump condition, the first step is to take X-rays to determine whether the stump is worth preserving. If the residual root is well treated and the root length is sufficient, a pile crown restoration should be performed. If there is no retention value, it needs to be extracted as soon as possible. In elderly people, if only a single tooth or a few teeth form a residual root and the remaining teeth are healthy, the root is judged to have retention value and the affected tooth is restored to form and function through a pile crown restoration. If multiple teeth are missing and have residual roots, and there are few remaining healthy teeth, root canal treatment can be performed on the teeth with retained value of residual roots. After the root canal treatment, the tooth is trimmed from the neck of the tooth and made into a covered denture, or made into an abutment with attachment using the residual root. At this time, the treated residual root can play the role of supporting, supporting, connecting and retaining the movable denture and the alveolar bone, avoiding a large amount of resorption of the alveolar bone, and at the same time increasing the bearing strength of the denture, making the movable denture more useful.