Dental caries means tooth decay, which cannot be restored by brushing. Dental caries is a bacterial infection of the tooth and invasion of the hard tissues of the tooth, cavities and tooth damage can occur, the surface of the tooth will turn black, and the cavity can cause pain when food is embedded in the cavity. The main treatment is to remove the localized decayed part of the tooth and then fill it with filling material to stop further aggravation of caries. Brushing can only remove the food debris, bacteria or plaque on the surface of caries, but not the bacteria that penetrate into the hard tissues of the teeth, and cannot treat caries, but only play a preventive role. Therefore, brushing can not restore the teeth that have been caries. When you find caries, you should seek medical treatment as soon as possible, and standardize the treatment under the guidance of the doctor, so as to avoid further aggravation of caries. In addition, should also pay attention to careful brushing, maintain oral hygiene to prevent caries.