Toothache causes pain in half of the face and is commonly associated with two diseases, first, acute pulpitis; second, known as trigeminal neuralgia. Acute pulpitis is largely due to the infectious inflammation caused by tooth decay invading the pulp of the tooth, typically characterized by paroxysmal spontaneous pain, nocturnal pain, pain that is difficult to locate, and radiating pain. Radiating pain is the pain caused by acute pulpitis, which often radiates to the auriculotemporal or head and face. Another condition called trigeminal neuralgia is a kind of neurogenic pain, in which the pain is intense, but there is a certain interval, in which the patient has no obvious pain symptoms, and there is a typical characteristic of trigeminal neuralgia, that is, most of the trigeminal neuralgia can find the trigger point, and the patient will have obvious and intense pain when the trigger point is touched accordingly.