How could you explain the mechanism responsible for the formation of dental caries by resident microorganisms?
Bacteria. Literally have thousands of different types of bacteria living in our mouths, most of which help us digest our food. The bacteria will layer in specific order on and around the teeth. Food debris, in particular sugars/starches/acids, will gradually be converted into hydrochloric acid which will etch calcium out of the enamel, allowing bacteria to penetrate the tooth, destroying tooth material.