Reasons for the 2015 PHS Recommendation That the Optimal Fluoride

Reasons for the 2015 PHS recommendation that the optimal fluoride level be changed to 0.7 ml F per liter of water regardless of climatic conditions include which of the following?

A) A trend of increasing prevalence of fluorosis where multiple sources of fluoride are available.
B) The controlled climate results in similar water intake across the United States
C) Increase in access to multiple fluoride sources.
D) A trend of increasing prevalence of fluorosis where multiple sources of fluoride are available. The controlled climate results in similar water intake across the United States. Increase in access to multiple fluoride sources.

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