Toothache radiating to half of the headache is the most typical manifestation of acute pulpitis, which should be treated promptly at the dentistry department and requires a clear diagnosis by the doctor, as sometimes radiating pain is prone to misdiagnosis. With the outflow of blood and pus, the pressure in the pulp cavity will be relieved and the pain will gradually improve, after which the doctor will seal the pulp cavity with pain-relieving and anti-inflammatory drugs and the patient’s pain will be resolved. After the pain is completely eliminated, the patient has to undergo a formal root canal treatment.