Fillings without scraping the black clean, the following adverse consequences will occur: 1, the anterior region of the black dental tissue and fillings between the formation of a clear demarcation line, affecting aesthetics. 2, the black dental tissue contains bacteria will continue to erode the dental tissue, resulting in the expansion of caries, teeth meet cold, hot, sour, sweet and other stimuli to produce pain, caries infection to the pulp, will cause an attack of acute endodontic inflammation, pain is severe, and sometimes When the cavity is infected to the pulp, it will cause acute pulpitis with severe pain, sometimes radiating to the upper and lower teeth on the same side, which can not be clearly localized.3. After filling directly, secondary caries will occur between the edge of the carious cavity and the filling, resulting in loosening and detachment of the filling, and finally the filling will fail.