Digestion starts in mouth. The function of mouth in the digestion is to break down the large bulk of food into small ones by chewing. Salivary glands aid the breaking down the food by lubricating the food with salvia. These glands digest carbohydrate from long chains into small ones. For example, it digests the polysaccharide into disaccharide maltose. This digestion done by enzyme secreted by these glands, which is called "Salivary Amylase". In human, because of not chewing food efficiently, carbohydrates need over-digestion.
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