Participants living between 50% and 75% and <50% of their lives in fluoridated areas presented a decayed and filled teeth mean ratio of 1.34 (95% CI, 1.02–1.75) and 1.47 (95% CI, 1.05–2.04) higher than those with residential access to fluoridated water >75% of their lifetime, respectively. Longer residential lifetime access to fluoridated water was associated with less dental caries even in a context of multiple exposures to fluoride.

Access to Fluoridated Water and Adult Dental Caries
A Natural Experiment
Journal of Dental Research
M.A. Peres, K.G. Peres, P.R. Barbato, D.A. Höfelmann
Volume: 95 issue: 8, page(s): 868-874


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