Tooth decay is medically known as dental caries. Anti-cavity toothpaste cannot repair cavities. Anti-caries toothpaste can only play a preventive role in the absence of caries, once caries, the use of anti-caries toothpaste is useless. Dental caries is the hard tissue by different degrees of damage to the statement, want to repair dental caries, to go to a professional oral health care institutions for dental caries decay and filling, general application of dental high-speed turbine drilling to completely remove decay disintegration of carious tissue, and then dental special restorative materials, such as silver amalgam fillings, composite resin fillings for filling, which is the perfect treatment process. Daily brushing with anti-caries toothpaste can be used to prevent the occurrence of dental caries. Once caries is detected, it is important to intervene early, do not wait until the cavity is large before treatment will be more difficult and the cost will increase accordingly.