The condition of “dry mouth” is called Xerostomia. This condition occurs when the salivary glands don’t work properly and the amount of saliva in the mouth decreases. Saliva is vital to everyday processes- tasting, swallowing, speaking and digesting. Saliva acts as a natural defense for the teeth. Without saliva, the teeth are extremely vulnerable to fungal, bacterial and viral infections, and decay. Although saliva is mostly composed of of water, it also includes electrolytes, antibacterial compounds, and various enzymes. These components play a major role in keeping your mouth healthy.