28 mineral elements have been found in the tea flush. Compared to other plants, tea has a higher than average amount of fluorine, manganese, arsenic, nickel, selenium, iodine, aluminum, and potassium. Tea also has an unusually high amount of fluorine, which has been known to help prevent tooth decay in humans, however too much fluorine can be harmful. It is important to note that fluorine occurs in greater amounts in older tea leaves. Tea minerals vary greatly with each harvest and change greatly during processing