That strange fuzzy feeling you get on your teeth when eating certain foods and drinks come from acids, and all acids can create a weird feeling in your mouth to a certain degree. Wines and teas are famous for having tannic acids, strawberries have malic acid, and spinach and bananas both have oxalic acids. There are many other examples of this phenomena, and some of these dietary acids can be bad for your tooth enamel. Lately, I have been fielding a lot of questions on Quora