I know! It's completely shocking to me about fluoride in tea. I'm not certain I would have even believed it if I hadn't experienced such dramatic affects from it. The fluoride content in tea is well documented though. To avoid fluoride and still drink tea, look for tea grown in Japan, where the soil contains less fluoride than in India and China. Also, the more expensive the tea, the lower the fluoride - generally. This correlation was found by several studies. It's probably because the older the plant, the more fluoride and also the more bitter the tea. Expensive tea is made from younger plants because it tastes a little better, and it happens to also have less fluoride.
Green tea has such big reputation for improving health, and yet it contains fluoride and no one is really talking about it. I have a theory that when someone begins to drink green tea, they feel a positive change in the beginning, because the fluoride fills up some Iodine receptors in the thyroid, leaving more Iodine for other parts of the body. Perhaps initially, a person would get this short-term boost from the actual fluoride in the tea. Just a theory.