Supposedly, people have induced fluorosis by drinking too much green tea. Tea and the development of fluorosis | MedTube Tribune - Medical news on-line
And it does, as far as I know, cart calcium away from the bones which could contribute to kidney stones or osteoporosis. But a few cups a day for your only vice? I say go for it!
It can be tricky to separate myth from truth when it comes to tea.
Steak, eggs, potatoes - fruits, nuts, berries and forage. Coconut milk and potent herbs and spices. Tea instead of coffee now and teeny amounts of kelp daily. Let's see how this does! Not really had dairy much, and gut seems better for it.