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      Question

      What is the recommended fluoride concentration in

      drinking water to protect teeth against decay?
      A 5 ppm Correct Answer Incorrect Answer
      B 10 ppm Correct Answer Incorrect Answer
      C 1 ppm Correct Answer Incorrect Answer
      D 20 ppm Correct Answer Incorrect Answer

      Solution

      The recommended fluoride concentration in drinking water to protect teeth against decay is approximately 1 ppm, as it falls within agreed safety limits.

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