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Author Question: What is the optimal level of fluoride in water? (Read 350 times)

leo leo

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What is the optimal level of fluoride in water?


◦ 0.1-0.6 ppm
◦ 0.7-1.2 ppm
◦ 1.5-2.0 ppm
◦ 2.5-3.2 ppm


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Marked as best answer by leo leo on May 15, 2019

patma1981

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leo leo

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Excellent



patma1981

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Great! Please up vote :D



 

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