Kentucky requires water utilities serving more than 3,000 customers to add low levels of fluoride to drinking water which, according to the National Institutes of Health, helps prevent cavities and tooth decay. (Kentucky Lantern photo by Sarah Ladd)House Bill 103 would leave the decision on whether to add fluoride to water up to the local water systems’ governing bodies. (Kentucky Lantern photo by Sarah Ladd)“The preponderance of evidence shows that fluoride has been safe,” Robertson said. Kentucky Lantern maintains editorial independence. Follow Kentucky Lantern on Facebook and Twitter.