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What concentration of fluoride ions in drinking water is considered safe to prevent tooth decay?

Options

  1. A5 ppm
  2. B2 ppm
  3. C1 ppm
  4. D10 ppm

Correct answer

C. 1 ppm

Step-by-step solution

A fluoride ion concentration of 1 ppm (1 mg dm-3) is considered safe to prevent tooth decay.

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