Humans produce about 2 liters of saliva per day.
Sources
- Fascinating Facts About Your Body - WebMD (webmd.com)
- https://www.ck12.org/flexi/earth-science/distribution-of-water-on-earth/how-many-gallons-of-saliva-do-we-produce-in-a-lifetime/ (ck12.org)
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6855406/ (ncbi.nlm.nih.gov)
- https://www.iflscience.com/how-much-saliva-will-you-produce-in-your-life-67841 (iflscience.com)
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