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The average person produces around 20,000 liters of saliva over a lifetime. That's enough to fill roughly two standard bathtubs. Saliva does much more than keep your mouth wet—it helps digest food, protects your teeth, and fights harmful bacteria. Without it, eating and speaking would become much more difficult.
Your body quietly produces it every minute of every day. One of the most important liquids in your body is also one of the most overlooked.
© National Institutes of Health