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There seems to be good evidence that the elimination of sugar from the diet, and the provision of carbohydrate in the form of starch, affords a less favourable oral medium for the development of acid-forming organisms, and so protects the teeth against acid decomposition.
It appears probable that the provision of an abundance of vitamin D, either taken directly, or derived from the action of ultra-violet rays on the skin, exerts a favourable action on the immunological mechanisms in the oral secretions or on the epithelia of the mouth, and makes for preventing the growth of excessive numbers of acid-forming organisms.