Factors influencing the urinary fluoride level in subjects drinking fluoride-poor waters.

The influence on the urinary F level of the short-term consumption of drinking water of 1 mg/litre fluoride content, of the ingestion of low (1.0 to 2.0 mg) and higher (7.0 and 8.0 mg) fluoride doses and of tea has been studied. Excess fluoride is rapidly excreted with urine, and may disturb the results of urinary fluoride estimation. The urinary F level responds sensitively to the ingestion of fluorine.