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There is much debate about the amount of saliva that is produced in a healthy person per day; estimates range from 0.75 to 1.5 litres per day while it is generally accepted that during sleep the amount drops to nearly zero.
The three paired salivary glands and small buccal glands located throughout the oral cavity contribute to the approximately 1 liter of saliva produced in a day. Salivary flow can vary between 800 milliliters and 2 liters but this is regulated by a number of factors, especially nervous control by the brain stem. Saliva is a combination of a serous and mucoid fluid. The serous fluid is watery and contains the enzyme ptyalin which the starts the digestion of carbohydrates.