When a 52-year-old Missouri woman went to the doctor in 1998 complaining of a sore back, she was thought to have disc disease. Turned out she was drinking inordinate amounts of instant ice tea, which lead to skeletal fluorosis. But the average teetotalers should not be concerned. "It may be that certain brands ought to cut down the amount of fluoride in their tea or add a warning label to their product, "said Michael Kleerekoper, director of research of bone and mineral metabolism at Wayne State University .