Cavities do not clean themselves. Dental tissue is divided into three layers from the outside in, enamel (dentin), dentin, and pulp. Cavities are holes left by bacteria that invade the tooth tissue and cause it to collapse after demineralization. Although the center collapses, there is still a large amount of demineralized tissue around the perimeter of the hole, which contains a large number of bacteria. Dental enamel is the hardest tissue in the human body, and dentin is also harder than bone tissue. It requires a special high speed dental handpiece and a combination of emery or tungsten steel lathe needles in order to grind away the carious tissue and reach the normal tissue level, so it is not possible to clean it by yourself. Caries is a chronic progressive disease, if not dealt with in the early stage, it will gradually progress to cause pulpitis or periapical inflammation, it is recommended to go to the regular hospital stomatology department regularly, early detection and early treatment.