The food is ground up by the teeth and moistened with saliva to make it easy to swallow. Saliva also has a special chemical, called an enzyme, which starts breaking down carbohydrates into sugars.
Two kinds of digestion in mouth are Mechanical or physical process It includes physical breakdown of food molecules into a smaller and absorbable form. Chemical processes It includes a series of chemical reactions, which occurs within the stomach with the action of the gastric juices and enzyme.
Mechanical digestion involves the mechanical breaking down of food into smaller pieces. It begins in the mouth with chewing. The tongue and the teeth play the most important roles here in moving the food around and chewing. Chemical digestion involves the chemical breakdown of food by different enzymes and chemicals.
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