9. What is the amount of fluoride concentration in water that's considered safe for the prevention of dental decay? A. 0.25 part per million B. 2 parts per million C. 0.5 part per million D. 1 part per - Askians

9. What is the amount of fluoride concentration in water that's considered safe for the prevention of dental decay? A. 0.25 part per million B. 2 parts per million C. 0.5 part per million D. 1 part per

asked Feb 8, 2019 102k views

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