Fluoridation
Results show that adults with more than a 75 percent lifetime exposure to water fluoridation have significantly reduced tooth decay ( up to 30 percent less) when compared with those less than 25 percent lifetime exposure.
“Those people who have had longer exposure to fluoride in water obviously will have a greater benefit. However, and this is an important aspect of the study, even those people who were born before water fluoridation existed have since received some benefit in their lifetimes,” Professor Roberts-Thomson says.
Dental Tribune March 18-24th 2013