dinaprincess123 dinaprincess123

05-08-2018
Health

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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 million

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pandamille pandamille

05-08-2018

Hi,

9. What is the amount of fluoride concentration in water that's considered safe for the prevention of dental decay?

D. 1 part per million

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