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The biological reason for the occurrence of "mouth watering" is due to the salivary glands releasing saliva and enzymes into the mouth. This process helps in moistening food, making it easier to form a bolus (a small rounded mass of a substance, especially of chewed food) and swallow. The moisture from saliva aids in the initial breakdown of food and lubricates it for easier swallowing.
Additionally, the act of mouth watering does not directly speed up mechanical digestion but plays a crucial role in the initial stages of digestion by preparing the food for further breakdown.
In summary, mouth watering is a natural response triggered by the salivary glands to help facilitate the process of digestion by moistening food, aiding in swallowing, and initiating the breakdown of food particles through the action of enzymes present in saliva.