When the teeth are black and have cavities, oral examination and X-ray are needed to finally determine the treatment plan as follows: 1.When the scope of blackened teeth is small and the cavity is not deep, the discolored dentin can be removed by using high speed fissure drill, prepare the cavity shape, and use composite resin or glass ionized cementum for filling. 2.When the cavity is large and deep, and the cold, hot, acid, sweet and other stimuli produce sensitive symptoms, the scraping spoon can be used to remove If the X-ray shows that the pulp has been exposed, the pulp should be removed under local anesthesia and the inlay or full crown restoration should be made after the root canal treatment.