Tooth pain caused by fire with no apparent disease is called fire tooth. Symptoms are usually vague, may be caused by irritation or may be spontaneous, and the pain is usually not severe. The pain is usually not severe and can be temporarily forgotten due to distraction during work or sports. At the same time, it is necessary to pay attention to the physical state during the period of toothache, if it is in a sub-healthy state, such as overeating, irregular diet, poor immunity, poor rest, can cause fire tooth. This situation needs to go to the hospital stomatology department to check whether the teeth have caries, periodontitis and other diseases, and specific dental imaging to check whether there are hidden cracks deep in the teeth.