Multiple choice general knowledge The average human produces a quart of saliva a day or 1,000 gallons in a lifetime. True False Reveal answer Fill a bubble to check yourself B Correct answer Explanation A typical human produces about 1-1.5 liters of saliva daily. A quart (0.95 liters) per day would equal roughly 760 liters over 80 years - far less than the claimed 1,000 gallons (3,785 liters). The stated figure is exaggerated.