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Blizzard [7]
3 years ago
7

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

Health
1 answer:
Lisa [10]3 years ago
3 0

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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In order to use the calendar method of birth control, one might know hot to calculate the beginning and end of the fertile period.

The beginning of the fertile period can be calculated by subtracting 18 days from the length of the shortest cycle. This will determine the first unsafe day.

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The average length of a cycle cannot be used, but the individual's own shortest and longest cycles have to be used for calculation.

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