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Public Health · single question

What is the optimal community water fluoridation level?

  1. 0.3 ppm
  2. 0.5 ppm
  3. 0.7 ppm
  4. 1.0 ppm
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Correct answer: C. 0.7 ppm

The U.S. Public Health Service recommends 0.7 ppm for community water fluoridation (updated 2015).
  • A. ❌ 0.3 ppm is too low for effective caries prevention.
  • B. ❌ 0.5 ppm is below the recommended level.
  • C. ✅ CORRECT – 0.7 ppm is the current USPHS recommendation.
  • D. ❌ 1.0 ppm was previously used; current standard is 0.7 ppm.

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