This natural fluoride level
in drinking water is de- rived from the solvent action of water on rocks and soils of the earth's crust.
In addition, baseline data was collected in Aurora, Illinois, where the public water supply had a natural fluoride level
of 1.2 ppm and there was a much lower frequency of cavities.
Highest natural fluoride level
concentration reported being 38.50 mg/l in Haryana.
The resulting fluoride concentration was noted to be 1.4 ppm, which was indicative of a high level of natural fluoride level
in the water samples obtained.
The area with the highest natural fluoride level
, Hartlepool, had only a third of the decay of three other areas and there was no noticeable harm to the children.
live in an area with a nonfluoridated water supply or low (< 0.3 parts per million) natural fluoride levels
The present study defined a nonfluoridated site as having water fluoride levels (both adjusted and natural fluoride levels
) of <0.3 mg/L.
In the Northeastern region of Brazil some inland cities from Paraiba and Ceara have moderate to high natural fluoride levels
(>1.0 mg/L) in the drinking water resulting in high prevalence of dental fluorosis and some severe cases (1-3).