The recommended levels for water fluoridation in the United States range from 0.7 to 1.2 parts per million (ppm)of fluoride,depending on the:

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The recommended levels for water fluoridation depend on the average daily temperature for that area.This range is based on the hypothesis that water consumption increases with increasing climatic temperature.This assumption may not be as accurate as earlier research indicates because of the increased use of air conditioning and the increased consumption of soft drinks and bottled water.

The Recommended Levels for Water Fluoridation in the United States