Why is saliva important for my teeth and mouth?

When salivary flow rate increases, salivary film velocity increases. This enhances cavity prevention by more rapidly clearing food particles containing carbohydrates. Individuals with unstimulated, low velocity saliva swallow less efficiently and clear sugars from the mouth much more slowly. Such individuals are more susceptible to erosion and decay.

Saliva is the primary protection against the loss of tooth surfaces and its calcium and phosphorous minerals maintain the integrity of the enamel surface. Reductions in salivary flow lead to acid conditions and subsequent enamel demineralization. Small quantities of fluoride at the saliva-enamel boundary boost the maintenance of enamel structure. Fluoride is stored in a "reservoir" on the teeth and in the plaque in the form of calcium/fluoride-like precipitates. During an acid attack the calcium/fluoride-like material dissolves easily, releasing fluoride when and where it is needed. Since most foods contain sugars or starches they may lead to plaque acid when eaten. Chewing after a snack or meal stimulates salivary flow, increasing its cavity preventing properties.