Municipal water fluoridation, adolescent IQ, and cognition across the life course: Evidence from the Wisconsin Longitudinal Study Edited by Greg J. Duncan, University of California, Irvine, CA; received December 10, 2025; accepted March 5, 2026 Abstract We investigate associations between community water fluoridation (CWF), adolescent IQ, and cognition across the life course using representative data from the US state of Wisconsin.