Which of the following is the accepted safe level of flouride in drinking water ?: (A) 0.5 - 0.8 ppm, (B) 1.5 - 3 ppm, (C) 76 ppm, (D) None
Answer is A. The accepted safe level of fluoride in drinking water is 0.5 - 0.8 ppm. Deficiency of fluorine in drinking water is associated with dental caries and excess with dental and skeletal fluorosis.