A new study from researchers at the University of Minnesota's Life Course Center (LCC) challenges long-held misinformation regarding the safety of water fluoridation, finding that at recommended levels the mineral is associated with better cognitive performance in adolescents, not worse. Published in Science Advances, the research is the first U.S.-based investigation to examine the effects of fluoride at levels naturally occurring and recommended by the Centers for Disease Control and Prevention (CDC). The team utilized data from the nationally representative High School and Beyond cohort study, tracking ~13,980 individuals from high school into midlife.