Eating steamed bread toothache may be caused by deep caries, cryptic fracture, chronic pulpitis, apical periodontitis and so on. 1. Deep caries: When deep caries has a large cavity and reaches the dentin, the bun embedded in the cavity will cause irritating pain. 2. Cryptic fissure: when the fissure of cryptic fissure is deeper, there will be chewing pain, and the teeth will have occlusal pain when eating buns, and the pain symptoms will disappear immediately after the stimulus is removed. 3. Chronic pulpitis: chronic pulpitis has long-term pain of hot and cold stimulation or chewing pain, eating steamed bread will appear slight occlusal pain or knocking pain, generally can be clearly affected teeth. 4. Periapical periodontitis: Periapical periodontitis inflammation is mainly concentrated in the apical part of the root, there will be occlusal pain and discomfort when eating, and the affected tooth can be clearly identified. Tooth eating buns pain in a timely manner to the hospital, a clear cause after active treatment, in order to facilitate the recovery of the condition.