Toothache is roughly divided into the following categories: 1. Pain of pulpal origin, commonly seen in patients with pulpitis. The pain caused by pulpitis is usually more intense pain, when eating cool, hot, sour, sweet and other irritating foods will lead to severe pain in the teeth, the pain lasts longer, and at the same time will spread to the whole face and even the head, and there will be spontaneous pain and night pain, many pulpitis patients in the night pain can not sleep. 2, pain of periodontal origin, due to chronic periodontitis The pain is caused by chronic periodontitis or periodontal abscess, this pain is a long-term tooth swelling discomfort, unable to bite hard objects, in the acute period of periodontal abscess will lead to tooth loosening obvious, unable to bite. 3, pain caused by infection, such as wisdom teeth pericoronitis patients, due to inflammation of the soft tissue around the wisdom teeth will cause swelling and pain in the jaw and face, mouth opening restrictions and other symptoms. 4, pain caused by trauma resulting in tooth fracture fracture.