Nobody mentioned any convincing reason adults previously exposed to fluoride should care; I’d point out that I currently have citations to 3+ studies showing no intellectual benefits to iodine supplementation in elementary age and older kids or adults, and iodine’s effects on IQ are much better established than fluoride.
Previous fluoride discussion: http://lesswrong.com/lw/a5f/water_fluoridation/
Nobody mentioned any convincing reason adults previously exposed to fluoride should care; I’d point out that I currently have citations to 3+ studies showing no intellectual benefits to iodine supplementation in elementary age and older kids or adults, and iodine’s effects on IQ are much better established than fluoride.