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Incidence of Fluorosis and Urinary Fluoride Concentration are not Always Positively Correlated with Drinking Water Fluoride Level

The aim of this study was to assess the effect of fluoride on human health, focusing on the incidence of fluorosis, urinary fluoride concentration and fluoride level in drinking water in three fluoride-affected villages of Birbhum district, West Bengal, India. In one village urinary fluoride concentration was very high along with the occurrence of severe dental and skeletal fluorosis, though fluoride level in drinking water was within the permissible limit. The present study suggests that fluoride intake through other sources is also an important contributing factor in fluorosis, corroborating previous reports on high fluoride contents in crops and vegetables grown in fluoride-affected areas.