If the tooth becomes sore and soft after the nerve is killed, it may be caused by residual pulpitis, periapical inflammation, occlusal trauma, etc., and needs to be treated symptomatically.
1. Residual pulpitis: If the tooth is still sore and soft after the nerve is killed, it is possible that some of the pulp in the lateral or secondary root canals has not been completely killed, resulting in residual pulpitis, which needs to be diagnosed by taking apical radiographs or CT in the hospital’s Department of Stomatology, and then undergo endodontic treatment again.
2. Periapical inflammation: If the nerve is simply killed, bacteria and infectious substances may appear in the root canal of the tooth, resulting in inflammation of the periapical tissues, which will cause the tooth to experience symptoms such as pain and discomfort, and further refinement of the root canal treatment is required.
3. Occlusal trauma: After the nerve is killed, the tooth loses its sensibility to temperature and stimuli such as sweet and sour, but the periodontal tissues at the root of the tooth are still able to perform their normal functions and are sensitive to pain, pressure, vibration and other sensations. Therefore, if there is a concentration of stress in the bite of the teeth, resulting in occlusal trauma, the teeth may also be out of the soreness, the need to go to the hospital to check the bite relationship, and timely adjustment.