Allergy after scaling should refer to tooth sensitivity after scaling. Mostly due to the removal of calculus during scaling, so that the neck of the tooth exposure, dental nerve sensitivity caused by local conservative treatment or the use of medication desensitization treatment, etc.. Scaling is the process of removing supragingival calculus and subgingival calculus with ultrasonic scaler or manual scaler. Because of the removal of stones around the neck of the tooth and the root, the neck of the tooth is exposed, causing sensitivity of the dental nerve and cold and heat sensitivity of the teeth. Local conservative treatment can be carried out first, such as changing dietary habits, less drinking too cold, too hot food; local use of desensitizing medication toothpaste brushing, generally about 15 days, tooth sensitivity symptoms will be gradually relieved. If the sensitivity symptoms continue to be unrelieved and affect the normal diet, can be operated by the stomatologist using desensitizing gel and other drugs to rub the neck of the teeth for desensitization treatment, or the use of minocycline ointment periodontal medication, etc., which can effectively alleviate the sensitivity symptoms. If the tooth sensitivity continues to be unrelieved after scaling, the patient should consult a doctor in time, complete the examination, clarify the cause and diagnosis, and standardize the treatment under the guidance of a professional doctor.