How does digestion begin in the mouth?

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One of the constituents of food is starch. When food that contains starch is chewed, the saliva in the mouth brings about a chemical change in the starch. As a result of this change, the starch becomes a kind of sugar that is easy for the body to use as nourishment from the cells.
A substance, such as saliva, that changes food into a form that can be used by the body is called an enzyme. Enzymes are secreted by glands. Saliva is secreted by salivary glands in the roof and floor of the mouth. Only starch can be digested in the mouth. Fats and proteins the two other main constituents of food, must be digested farther along in the alimentary canal.

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