First, if the residual root is long enough, the periodontal tissue is in good condition, the periodontal membrane area is large enough, and the supporting force is sufficient, root canal treatment can be done first, the infected substances in the root canal can be removed, and the closed root canal can be filled to prevent infection, and then the residual root can be repaired, such as crown repair, inlay repair, root cavity repair, etc.
Secondly, if the residual root length is very small, the periodontal tissue is in poor condition, and the periodontal membrane area is too small to support the restoration of teeth, then the root can not be repaired, and it may also cause symptoms of complications such as periapical periodontitis, periodontitis and pain, and may continue to stimulate the oral mucosa in severe cases, and may also lead to the occurrence of oral cancer. Therefore, in general, it is recommended to remove this root to avoid other complications.