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[citation needed] In 1939, Dr. Gerald J. Cox [23] conducted laboratory tests using rats that were fed aluminum and fluoride. Dr. Cox suggested adding fluoride to drinking water (or other media such as milk or bottled water) in order to improve oral health. [24] In the mid-1940s, four widely cited studies were conducted.
Typically, a fluoridated compound is added to drinking water, a process that in the U.S. costs an average of about $1.32 per person-year. [2] [4] Defluoridation is needed when the naturally occurring fluoride level exceeds recommended limits. [5]
Too much fluoride can make your teeth brown, but getting a little bit is a dentist's dream. ... to stay cool — officials recommended 0.7 milligrams of fluoride per liter. ... earlier this year ...
By comparison, fluoride toothpaste costs an estimated $11–$22 per person-year, with the incremental cost being zero for people who already brush their teeth for other reasons; and dental cleaning and application of fluoride varnish or gel costs an estimated $121 per person-year.
Some 53% of these water systems have fluoride concentration within recommended levels - between 0.7mg per liter and 1.2mg per liter. Just under half of them (47%) have fluoride concentration under ...
Studies have validated fluoride’s benefits at low levels, but newer research shows risks.
Water fluoridation is the most cost-effective way to induce fluoride, with an estimated cost between US$0.50 and $3.00 per person per year, depending on the size of the community involved. [33] A dollar spent on fluoridating water is estimated to save $7–42 on dental treatment.
The same was true for fluoride levels of less than 1.5 mg/L, which is the upper safe limit of fluoride in drinking water as established by the World Health Organization.