Saliva is the watery and usually frothy substance produced in the mouths of humans and most other animals. Saliva is produced in and secreted from the salivary glands. Human saliva is 98% water, which carries electrolytes, mucus, antibacterial compounds and various enzymes. Enzymes begin the digestion process, breaking down some starch and fat at the molecular level. Saliva breaks down food caught in the teeth, protecting them from bacteria that cause decay. Saliva also lubricates and protects the teeth, the tongue, and the tender tissues inside the mouth. Saliva is inhabited by bacteria. Human bite wounds have a high risk of infection unless treated with antibiotics. Various species have evolved special uses for saliva that go beyond predigestion. Some swifts use their gummy saliva to build their nests. Some Aerodramus swiftlet nests are made only from saliva and used to make bird's nest soup. Cobras, vipers, and certain othe

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