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The saliva not only helps to moisturize and digest food, but also helps the tongue move and speak. The taste of the food is felt as the saliva dissolves the food particles. It also helps to control water levels in the body. When the body's water levels are low, the dryness is due to the reduction of saliva. This gives you a reference to water. The saliva helps tooth decay and prevents food particles from getting into the mouth without getting infected by other microorganisms. The enzyme amylase in saliva helps to convert the carbohydrates of the carbohydrates into a simple ingredient for chemistry.(Dr healer nisha)