Teeth hidden pain should be oral examination and oral X-ray film, the crown of the tooth exists more than moderate caries cavity, dentin tubules end open, can feel the external stimulation of hidden pain, too cool, too hot temperature stimulation can cause a transient stimulation of pain, should be abraded after the decay of the tooth tissue, the preparation of the cavity for the bottom of the cushion, fill the cavity. When chronic pulpitis or periapical inflammation occurs, the pulp gradually loses its vitality and the pain is no longer severe, the pulp can be removed under local anesthesia to complete root canal preparation, disinfection and filling. When there is obvious congestion, redness and swelling of the gums and other soft tissues around the teeth, it will produce involving pain and cause dull toothache, which requires periodontal scraping, flushing of periodontal pockets, oral anti-inflammatory drugs, etc., and the pain disappears after the inflammation is controlled.