Toothache after tongue cancer surgery may be due to the occurrence of caries in the tooth itself or radioactive caries in the tooth caused by radiotherapy after tongue cancer surgery. 1. Caries occurred in the tooth itself. After hand cancer surgery, toothache may be caused by the tooth has been decayed before, and the decay has progressed to a certain depth after surgery, which causes pulpitis or periapical inflammation and pain. 2. Radioactive caries. Toothache after tongue cancer surgery may also be due to radiation therapy after surgery, the radiation triggers different degrees of atrophy of oral glands, saliva secretion decreases, which can not be effectively flushed to the teeth, thus making the teeth rapidly produce caries and cause pain. For toothache after tongue cancer surgery, it is specifically recommended to go to dental hospital to check the cause of the disease and find out the problem and deal with it in time.