1. Decrease demineralization process : flouride replace hydroxyl gp in hydroxyappetite forming fluoroappetite which less soluble in acids and more acid demineralization. 2. Increasing...
Nice, we had the same textbook and had trouble on the same question. I'm probably too late to help you out but for anyone else having the same issue... Eubacteria is the cause of caries and cavities....
lack of brushing teeth, plaque not being removed on the teeth, acid on the enamel surface of the tooth, bacteria presenting in the mouth, carbohydrates(sugar, and starches) remaining on the surface...