Dental caries is also known as dental caries, dental caries due to dental tissue corruption and pigmentation can appear black, pain needs to be done according to the depth of caries medication or root canal treatment. 1. Medication: caries need to use professional instruments to remove decayed tooth tissue, deep caries will appear to the outside world embedded in the cavity of the pain, general use of calcium hydroxide cushion filling after the pain can disappear. If it has triggered pulpal inflammation, it is necessary to use clove oil to eliminate pulpal inflammation, and fill the bottom after no symptoms. 2. Root canal treatment: If the caries has penetrated the pulp cavity, the tooth will appear spontaneous pain, external hot and cold stimuli produce severe pain, occlusal pain, the need to carry out root canal treatment to eliminate pulpal periodontal inflammation, asymptomatic after the root canal filling and crown restoration. Worm tooth blackened pain is recommended to the hospital in time to deal with, to avoid aggravation of symptoms affecting oral health.