On any given day, your body produces about 50 ounces of saliva. But I bet you aren't thinking about your spit when it comes to general health. Believe it or not, it pays a major role in your health and disease risk. Saliva is a natural mouth disinfectant. It consistently works to help maintain the health of your gums, prevent tooth decay and even wash away food particles. It also provides disease-fighting substances to prevent cavities and other infections. When saliva keeps your mouth clean is when the condition of your spit is healthy. This key bodily fluid can provide clues to other things going on in your body. Pay attention to these signs.