Tapping soreness after root canal treatment may be caused by instrument irritation, unresolved inflammation of the apical root tissue, pulpitis, etc. The treatment varies according to the etiology. General treatment, medication and open root canal treatment can be chosen according to different causes. 1. Instrument stimulation: Tapping soreness after root canal treatment may be caused by instrument stinging on the tissues around the root of the tooth, which is very common and can subside on its own. Oral hygiene must be done during the recovery period to prevent infection. Avoid eating cold and sour stimulating food, so as not to cause the sensitivity of the sensory nerve endings to strengthen. 2. Root tip tissue inflammation has not subsided: knocking soreness after root canal treatment, may be the root tip tissue inflammation has not subsided. You can take amoxicillin capsules, ibuprofen extended-release capsules and so on for anti-inflammatory pain. 3. Pulpitis: Root canal treatment is not complete, not clean the pulp, complete the treatment of the residual pulp caused by inflammation, the patient needs to be in the stomatologist’s guidance, open root canal treatment, the residual pulp clean. After root canal treatment knocking soreness, it is recommended that the patient be admitted to the hospital in time for review and take appropriate treatment measures to avoid further aggravation of the condition.