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Public Health · single question

What is the ideal fluoride concentration in community drinking water?

  1. 0.7 ppm
  2. 0.7 ml
  3. 1.0 ppm
  4. 1.2 ppm
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Correct answer: A. 0.7 ppm

The CDC-recommended optimal fluoride level in community water is 0.7 mg/L (ppm) — updated in 2015 from the previous 0.7–1.2 range. 'ml' is a volume unit, not a concentration unit, so option B is nonsensical. 1.0 and 1.2 ppm are outdated and above current recommendations.

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