Sore teeth but no pain when brushing may be due to dentin exposure, removal of local irritants and other reasons. 1. Dentin exposure: toothache but brushing and no pain may be enamel defects caused by dentin exposure, after brushing the mouth to remove the sweet and sour substances, saliva does not contain sweet and sour substances, will not stimulate the nerve endings in the dentin tubules, the pain will temporarily disappear. Dentin exposure is associated with tooth decay, fissure, wedge-shaped defects, heavy wear and other factors that require attention. 2. Remove local irritants: toothache but brushing does not hurt, there may be local irritants in the teeth, such as food impaction caused by toothache, through brushing the teeth to clean the teeth of foreign objects, toothache can slowly disappear. Toothache but brushing and no pain most of the temporary relief, and can not be cured, it is recommended to find toothache but brushing and no pain symptoms should go to the regular hospital in a timely manner.