Intermittent toothache may be deep dental caries, pulpitis and periapical periodontitis, or acute gingival papillitis, which requires an oral examination at the hospital. 1. Deep caries. When the teeth are decayed, dietary food stuffed into the cavity will appear in the cavity pain, remove the embedded food pain can disappear. 2. Pulpitis. When pulpitis occurs, when stimulated by external factors or hot and cold stimulation, can cause tooth pain, no stimulation of the tooth can also appear spontaneous pain, pain was paroxysmal, at this time, the pulp has been infected, the need for root canal treatment. 3. Periapical inflammation. When pulpitis further develops into periapical periodontitis, bite pain will occur in the upper and lower bite of the tooth, and there is also spontaneous pain, and the pain can be sustained. 4. Acute gingival papillitis. Acute gingival papillitis can be triggered by food impaction in the teeth, spontaneous pain occurs, the pain disappears after removing food debris, but the pain can recur when the next diet. Intermittent toothache is recommended to go to the hospital as soon as possible to check the cause of the disease, timely treatment, to avoid affecting the work and life.