Tooth sensitivity after root canal treatment may be caused by tooth wear, pulpitis, etc., and needs to be dealt with on a case-by-case basis. 1. Tooth wear: tooth sensitivity after root canal treatment may be due to other bad teeth in the mouth, especially the teeth adjacent to the tooth for which the root canal treatment was performed, if there are caries or attrition, tooth sensitivity will also occur. It is necessary to check the neighboring teeth or the teeth of the opposite jaw for caries or attrition, so that the symptoms can be relieved in time. 2. Residual pulpitis: In the root canal treatment, if the pulp is not cleaned up resulting in pulp residue, tooth sensitivity may occur, at this time you need to improve the examination, clear diagnosis, and then open the root canal treatment of the tooth again, thoroughly remove the residual pulp, you can eliminate the symptoms. Root canal treatment after tooth sensitivity, you can go to the hospital in a timely manner, clear cause for targeted treatment.