Recommended concentration of fluoride in a community water supply is:

 # The recommended concentration of fluoride in a community water supply is:

A. 0.1 ppm

B. 0.5 ppm

C. 1 ppm

D. 2 ppm

The correct answer is C. 1 ppm.

A formula given by Galagan and Vermillion is used to decide the amount of fluoride that should be added to the drinking water and is as follows: 

Galagan and Vermillion formula: Amount of fluoride in ppm = 0.34/E

Where E = – 0.038+0.0062 × temperature in °F. 

Recommended= 0.7 to 1.2 ppm (0.7 ppm in tropical climate and 1.2 ppm in cold climate).

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