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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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