Root canal treatment has been done, after wearing the crown is still a little painful when pressed, usually related to physiological factors, post-operative gingivitis, apical abscess, etc., according to the cause of the general treatment, drug treatment, surgical treatment. 1. Physiological factors: mainly caused by the wound not healed after root canal treatment, it is a normal reaction, more common in the early stage, usually with the passage of time the symptoms will gradually reduce. 2. Gingivitis: If you do not pay attention to oral hygiene after root canal treatment, repeated microbial and bacterial stimulation, gingivitis will be formed, which will cause pressure pain. It can be timely consultation and local rinsing, oral amoxicillin, metronidazole as prescribed by the doctor, after the elimination of inflammation can effectively reduce the pain. 3. Apical abscess: root canal treatment of infected inflammation is not timely treatment, repeated stimulation of apical tissues will form an abscess, resulting in occlusal pain. It is necessary to make a local incision and then rinse with saline to clean the pus, and if necessary, root tip surgery can be performed. If the pain continues to worsen after root canal treatment, it is recommended to go to the hospital in time to clarify the cause of the disease and follow the doctor’s instructions.