Abstract
155 adult natives of Boulder, Colorado, where the water is virtually fluoride-free, and 385 comparable natives of Colorado Springs, where the water contains about 2.5 ppm. of fluorides, were given dental examinations with mouth mirror and explorer. No fluorosis was seen in natives of Boulder; the prevalence of fluorosis was uniform throughout the age range of 20-44 yrs. at Colorado Springs. Dental caries rates were about 60% lower in each age group in Colorado Springs as compared with Boulder, and 3 or 4 times fewer teeth had been lost from that disease. There was no apparent diminution of caries inhibition through the age of 44 yrs. The observed caries-inhibitory effect was essentially similar in pattern and in magnitude to that seen in children native to fluoride areas.
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