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All tea leaves contain fluoride; however, mature leaves contain as much as 10 to 20 times the fluoride levels of young leaves from the same plant. [9] [10]The fluoride content of a tea leaf depends on the leaf picking method used and the fluoride content of the soil from which it has been grown; tea plants absorb this element at a greater rate than other plants.
Fluoride was known to enhance bone mineral density at the lumbar spine, but it was not effective for vertebral fractures and provoked more nonvertebral fractures. [62] In areas that have naturally occurring high levels of fluoride in groundwater which is used for drinking water, both dental and skeletal fluorosis can be prevalent and severe. [63]
Fluoride is sometimes present in tea; certain types of "brick tea", made from old leaves and stems, have the highest levels, enough to pose a health risk if much tea is drunk, which has been attributed to high levels of fluoride in soils, acidic soils, and long brewing.
It also did not answer what high levels of fluoride might do to adults. The American Dental Association, which champions water fluoridation, had been critical of earlier versions of the new ...
But a fluoride level of above 1.5 mg/L is found in wells and community water systems that serve over 2.9 million people in the U.S., according to the study authors. ... including “high risk of ...
U.S. standards recommend fluoride levels of 0.7 milligrams per liter of water, and the NTP’s conclusion applied to water fluorinated at 1.5 milligrams per liter and above. ... of Public Health ...
It was interrupted during 1976–1978 due to the shortage of sodium silico-fluoride. It was resumed only in the Fangcun district of the city, but was halted in 1983 after opponents claimed that fluoride levels were already sufficiently high in local foods and tea. Later analysis in 1988 found that the incidence of dental caries among 4-year-old ...
Fluoride is a naturally occurring mineral which is present in trace amounts in soil, plants, water and food, and at optimal levels helps to prevent cavities by keeping teeth strong.
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