Mouths contain more than 600 types of bacteria, which can cause a cut to become infected if you lick it.??? Saliva is mostly water, but it also contains electrolytes, bacteria, viruses, fungi, secretions from your nose and lungs, cells from the lining of your mouth and about 500 proteins; food debris and toothpaste are routinely found in saliva.??? While saliva does not contain your DNA, the cells