Many drink options can contribute to issues with dental health. Whether it’s the acid in fruit juices or the acid and sugar in soft drinks, it’s hard finding drinks that don’t harm teeth or, in fact help them. Tea is one of the best drinks for your teeth, research has found. This is especially true with green tea where antioxidants called catechins improve oral health. A study done in Japan found that almost all participants who drank at least one cup of tea a day showed improvement in gum health and reduced gum bleeding. Keep in mind though that while black tea is also good for health it causes staining of the teeth. But both teas are good for your health as long as you don’t add sugar to them. Source