Whether the split tooth can be retained depends mainly on the following aspects: First, whether the remaining tooth is strong and stable enough, that is, to determine whether the foundation is strong, which depends on whether the periodontium is healthy and whether the root is long enough. Because whether it is a filling or a crown restoration, it is impossible to build a high-rise building on a pile of sand is a reason. Secondly, where is the broken end of the split tooth? If the broken end is above the gum, it is very good to repair; if the split is below the gum or slightly below the bone, you can consider gingivectomy, gingivotomy, crown lengthening or orthodontic traction to expose the broken surface for repair according to the condition. If the split is deep under the bone, extraction may be the only option. The reason why the broken end of the split tooth is important is that if the broken end is not well exposed inside the mouth, the resulting restoration (denture) will be difficult to fit tightly and long-term use will cause periodontal inflammation and alveolar bone resorption. Third, consider the whole mouth situation, such as whether there are other dentures, how the teeth fit together, etc., and consider the treatment plan and cost. After a tooth split, the doctor needs to go through a comprehensive examination and evaluation to accurately determine whether it can be retained and how to repair it.