Tooth decay for many years needs to be repaired by filling, piling and core crown after nerve treatment, and may need to be extracted in severe cases, etc. Specific cases should be treated according to the doctor’s instructions. 1. Fillings: If the tooth is destroyed to form a deeper cavity, with more healthy tooth tissue remaining around it, it can be directly repaired after removing all the decayed material. 2. Nuclear crown restoration: If the defect is relatively large and involves nerve symptoms, it is necessary to carry out nerve treatment, root canal treatment after tooth repair and filling machine crown restoration. 3. Extraction: If the damage is more serious, the tooth forms residual roots, residual crowns, after taking dental films for evaluation, causing apical inflammation and tooth damage, it is necessary to carry out the earliest possible tooth extraction in order to alleviate the local inflammation. It is recommended to seek medical examination and treatment in a timely manner to control dental lesions after dental problems.