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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.
This is not an exact answer to your question, but I feel that many people underestimate the role saliva plays in our lives. The most important things that I can think of are: 1. Clearance of pathogens: on average, a human being will produce 1.5 liters of saliva per day.