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Public Health · single question

What is the recommended optimal fluoride concentration in drinking water for community water fluoridation?

  1. 0.7 ppm
  2. 1.2 ppm
  3. 1.5 ppm
  4. 0.5 ppm
Show answer and explanation

Correct answer: A. 0.7 ppm

  • A. CORRECT. The U.S. Public Health Service updated the recommendation in 2015 to a single value of 0.7 ppm (mg/L).
  • B. INCORRECT. 1.2 ppm was the upper end of the old range and is no longer recommended.
  • C. INCORRECT. 1.5 ppm exceeds the optimal level and raises fluorosis risk.
  • D. INCORRECT. 0.5 ppm is below the optimal caries-preventive level.

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