If the length is sufficient, crown lengthening or orthodontic retraction can be used to expose the section, and pile crown restoration can be performed on the basis of perfect root canal treatment. Crown lengthening is a periodontal surgical procedure to remove part of the gum and alveolar bone to expose the root section. Generally speaking, if the labial root surface is located too much under the gingiva, the crown lengthening alone may cause the gingival margin line to be inconsistent with the adjacent teeth, which is unattractive, and the crown-root ratio is also abnormal, and the restored tooth will easily loosen. Orthodontic traction is to expose the broken surface by traction of the residual root through orthodontic methods. However, the healthy periodontal tissues are often tractioned along with the root, resulting in the root margin being out of alignment with the adjacent teeth, so it is usually combined with crown lengthening to solve the aesthetics. If the root is too short and the broken end is too deep under the gingiva, it will not be considered for retention and the root will be extracted and restored with a dental implant.