Dental caries and dental plaque are two completely different concepts, dental caries is a disease, and dental plaque is a substance attached to the tooth surface, dental plaque is the causative factor of dental caries, the so-called dental caries is also called worm tooth and tooth decay, it is a disease caused by bacteria invading the hard tissue of the tooth and causing the decay and disintegration of the hard tissue of the tooth. The plaque is the colony of bacteria formed by bacteria and salivary proteins on the surface of the teeth in the mouth for a long time, and the attachment of plaque is difficult to be washed off by water, but it is easy to be brushed off by toothbrush.