A study by University of North Carolina at Chapel Hill and the University of Adelaide, Australia, produced strong evidence that fluoride provides increase protection against tooth decay, even those who have not received fluoridated as young children. In public health terms, it means that more people benefit from water fluoridation than previously thought.

The results, published online in the Journal of Dental Research, show that adults who spent more than 75 percent of their lifetime living in fluoridated communities had significantly less tooth decay (up to 30 percent less) when compared to adults who had lived less that 25 percent of their lifetime in such communities.

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