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Old 02-05-2013, 04:44 PM   #46
Eurobiker
Vintage Cat Herder
 
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Joined: Apr 2002
Location: Albuquerque, NM
Oddometer: 5,948
.7 ppm is the minimun dose as set forth by the PHS regulations. At the ABQ-Bern. Co Water Utility Authority, we meet that naturally, so additional floridation was stopped.

Current federal fluoridation guidelines, maintained by the PHS since 1962, state that community drinking water should contain 0.7--1.2 ppm fluoride, depending on the average maximum daily air temperature of the area. These temperature-related guidelines are based on epidemiologic studies conducted during the 1950s that led to the development of an algebraic formula for determining optimal fluoride concentrations (67,90--92). This formula determined that a lower fluoride concentration was appropriate for communities in warmer climates because persons living in warmer climates drank more tap water. However, social and environmental changes since 1962 (e.g., increased use of air conditioning and more sedentary lifestyles) have reduced the likelihood that persons in warmer regions drink more tap water than persons in cooler regions (7).

By 1992, fluoridated water was reaching 144 million persons in the United States (56% of the total population and 62% of those receiving municipal water supplies) (93). Approximately 10 million of these persons were receiving water containing naturally occurring fluoride at a concentration of >0.7 ppm. In 11 states and the District of Columbia, >90% of the population had such access, whereas <5% received this benefit in two states. In 2000, a total of 38 states and the District of Columbia provided access to fluoridated public water supplies to >50% of their population (CDC, unpublished data, 2000) (Figure 2).
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