What is the optimal level of fluoride in water?
A) 0.1–0.6 ppm
B) 0.7–1.2 ppm
C) 1.5–2.0 ppm
D) 2.5–3.2 ppm
B
Explanation: B) The optimal fluoride concentration of one's primary water source should be 0.7–1.2 ppm.
Health Professions
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On fusible-link detectors with replacable links, it is recommended that the links to be replaced at:
A. 2-year intervals B. 3-year intervals C. 5-year intervals D. 7-year intervals
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