Like when you take a spoonful of salt (not saying this is a normal thing, but this is what I did to spark the question), why does your mouth produce so much more saliva than normal?
Wherever there is sodium, water will flow. Your saliva is 98% water and is being attracted out of the glands. You also have a natural salivary response to the sensation of taste.
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Osmosis. Water the main ingredient in saliva flows from areas of low concentrations of salts to areas of high content till the areas balance out in their salinity.
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