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Saliva, also known as spit, is a watery fluid produced by the salivary glands and secreted into the mouth. Saliva is 98% water, with the other 2% consisting of electrolytes, mucus, antibacterial compounds, and various enzymes. The enzymes in saliva start digestion of the food by breaking down starch and fat. Saliva also breaks down food caught in the teeth, protecting the teeth from bacteria that could cause decay. Interested in learning more about the saliva? Check out the following videos on saliva. For additional information, also see our saliva reference materials.