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​Dental caries are holes on the tooth surfaces caused by acid damage that is the result of the enamel coming into contact with bacterial excretions. These bacteria are quite able to live and proliferate on the bristles of a toothbrush, regardless of the fact that toothpaste kills bacteria. This is because the bacteria that cause dental caries do so with a very interesting mechanism, namely, the formation of dental plaque and tartar. This is a calcified plaque layer that is resistant to attacks from the outside, and is the habitat that the bacteria live in.