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Public Health · single question

What is the currently recommended optimal level of fluoride in community drinking water?

  1. 0.3 ppm
  2. 0.7 ppm
  3. 1.2 ppm
  4. 2.0 ppm
Show answer and explanation

Correct answer: B. 0.7 ppm

  • A. 0.3 ppm is below the optimal range.
  • B. Correct. The U.S. Public Health Service recommends 0.7 mg/L (ppm) as the single optimal concentration to balance caries prevention and fluorosis risk.
  • C. 1.2 ppm was part of the older 0.7-1.2 range, now superseded by the single 0.7 value.
  • D. 2.0 ppm exceeds optimal and raises fluorosis risk.

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