Though bacteria play a major role in oral ecology, another key part is saliva. Saliva keeps the ecosystem of our mouth in balance. It contains its own bacterial enzymes that are beneficial to our health. An example of these are lysozomes. These antibacterial agents in saliva kill bacteria in our mouths and protect from potentially dangerous diseases. In addition, saliva contains phosphate and calcium ions that help repair microscopic chinks made in the teeth by the bacteria’s acid. The major organic constituents of saliva are proteins and glycoproteins. The main function of saliva is to flush out all of the micro-organisms that could potentially threaten our health. Although saliva does a lot to keep our bodies healthy, it cannot completely keep all bacteria from adhering to tooth, tongue or gum surfaces.