Instant tea may be a source of harmful levels of fluoride that can lead to bone pain, researchers discovered, after looking into the case of a woman who drank one to two gallons of super-strength tea every day. Dr. Michael Kleerekoper, a professor of medicine at Wayne State University who conducted a five-year national study of fluoride treatment for osteoporosis in the 1980s, said Whyte`s study shows that anything consumed to excess is not good, whether it\'s \"four gallons of pop or two liters of whiskey. Of all the dietary excess in society today, this is probably not the biggest culprit,\" he said. \"I\'m not minimizing his work, but the problem is one of excess.\"