Patient: I am a tetracycline tooth, caries two incisors had root canal treatment, but more than a year, the left two residual roots, the right two years ago screw pile plus dentures left three caries, right three had root canal treatment but not very good, left back there are residual roots. I would like to consult the order of treatment, and I would like to do all-ceramic restoration. I have a small piece of curved broken and front teeth. Jiang Ting, Department of Prosthodontics, Peking University Stomatological Hospital: The possibility of restoration is completely different for different degrees of residual roots, and it is still necessary to check before deciding. If the root canal is not complete, it should be retreated. If the root is too short, sometimes it cannot be preserved and sometimes it needs gum surgery (crown lengthening surgery). Teeth with incomplete root canal treatment that have had screw piles made may have to be removed first (prosthodontics). Come to the hospital first for an examination to determine the diagnosis. The doctor will propose a plan based on your case. Screw piles will be removed in the restorative department, root canal treatment and caries treatment will be done in the dental department, crown lengthening surgery will be done in the periodontal department, and tooth extraction will be done in the maxillofacial surgery department.