Bacteria in the mouth are frequently to blame for halitosis, or persistent bad breath. These microbes release gases that can smell. The decomposition of sugars and starches in food by microbes is what produces the odor. Halitosis can occasionally be a sign of a more serious ailment, including gum disease or tooth rot. Regular dental checkups are essential so that dentists can identify and address these problems early. Halitosis may also point to an underlying medical condition in another bodily part. Halitosis and other oral health problems are brought on by the circumstance of having a dry mouth. Dry mouth happens when the salivary glands in the mouth do not produce enough saliva to wash away food particles. This aids in regulating oral bacterial populations. Dry mouth can have a variety of causes. Dehydration is the most common cause. Diet and drugs can also have an impact on saliva production. There are no rigid guidelines for daily water consumption. However, the Food and Nutrition Board of the United States advises men and women to consume 3,7 l and 2,7 l, respectively, of fluid per day. The amount of water in these foods and beverages is also included. Green tea is a tea made from the leaves of the Camellia sinensis plant that is high in antioxidants. The main antioxidant in green tea is epigallocatechin-3-gallate (EGCG). According to research, EGCG may provide a wide range of health advantages. In a 2013 laboratory study, the effects of EGCG on human gum tissues were investigated. According to the study, EGCG encourages gum cells to produce an antimicrobial chemical.