Macey R, et al. - Researchers compared the proportion and severity of fluorosis in adults with lifetime exposure to water fluoridation with a nonexposed sample. They also reported the gradient of fluorosis severity by age. In adults with lifetime exposure to water fluoridation fluorosis is more common than those with no exposure, however, with age, the aesthetic impact of fluorosis seemed to diminish. Gradient by age was noted, the highest incidence of fluorosis being in the youngest and lowest being in the oldest age group.