If the black stuff in the teeth is not cavities, but exogenous food or bad habits, it can be removed by scaling combined with sandblasting and polishing. Generally speaking, for scaling, the main purpose is to remove the plaque, especially tartar, from the periodontium through ultrasonic combined with water rinsing. For the pigmentation on the tooth surface, sandblasting combined with polishing is used to remove it. Relatively speaking, scaling focuses on periodontal health to avoid periodontitis, while sandblasting combined with polishing focuses on aesthetics to make the tooth surface look neat and shiny. However, sometimes these three items are combined in the whole scaling operation, that is, the teeth will be scaled first, and then the teeth will be sandblasted and polished.