<prompt> Fluoride content in drinking water normally safe is0.5 mgl0.8-1.0 mgl0.2-0.8 mgl0.2-0.5 mgl  <response>: The recommended level if fluoride in drinking water in India is accepted as 0.5-0.8 mglitre 0.5-0.8 ppm In temperature countries where water intake is low, the optimum level of fluoride in drinking water is accepted as 1-2 mglitre Fluorine is a double edged sword : Inadequate intake is associated with dental caries whereas excess intake with dental and skeletal fluorosis Ref: Park 25th edition Pgno : 663 