There are two main reasons for black spots on teeth: the first reason is pigmentation. The second reason is dental caries. If it is pigmentation, the probe examination of the teeth is hard, and this situation does not need treatment, or scaling can be considered. If the teeth become discolored and black due to dental caries, and the probing teeth become soft, filling treatment is needed at this time. After all the black decaying materials are ground off, resin filling or other materials are needed. If the dental caries are deeply damaged, it may be necessary to cover the pulp first and then fill it. If the area of dental caries defect is relatively large, it may be necessary to consider inlay restoration, that is, after it is completed in vitro, it will be bonded with the defective tooth tissue for final restoration.