Removing a crown to injure an abutment tooth can be conditioned with general measures if the damage is minor. If the damage is large, the patient can take root canal treatment. Patients in the removal of crowns, the phenomenon of damage to the abutment tooth first to determine the extent of the damage, if the patient’s abutment tooth damage is not large, generally do not need special treatment. Patients are advised to eat less hard foods, such as nuts and hard candies. Patients should also eat less spicy and stimulating foods, such as chili peppers and garlic, to avoid irritating the teeth. Patients should ensure that their mouths are clean, and clean their mouths promptly after eating. If the patient’s abutment tooth has a more serious degree of damage, then root canal treatment can be performed. Root canal treatment mainly uses professional materials for filling, and patients should choose the professional hospital for treatment. Patients should consult a doctor in time and follow the doctor’s instructions when the crown removal damages the abutment tooth.