In a 55-yr-old woman with long-standing arthritis, but no obvious signs of fluorosis, X-rays
exhibited degeneration of discs and calcification in disc spaces. Her daily fluoride intake,
mainly from tea, exceeded 9 mg; her daily urinary excretion was 3 mg. When she discontinued
consuming tea, her fluoride intake fell below 1 mg daily; excretion through the urine exceeded
intake; the arthritic pains diminished and virtually ceased in 6 mo; mobility of her spine was
restored and she was able to resume work. Arthritis of the spine of unknown cause might
represent subclinical fluorisis which is not demonstrable radiologically.” Cook HA 1972
Crippling arthritis related to fluoride intake: Case report. Fluoride 5 (4):209-213 (1972)