Correlation link only at this point. From the abstract:
> Overall state water fluoridation prevalence (not distinguishing between fluoridation types) was also significantly positively correlated with state prevalence of ADHD for all but one year examined. [...] The relationship between fluoride exposure and ADHD warrants future study.
Still, it will be interesting to see what more comes out of this.
> Overall state water fluoridation prevalence (not distinguishing between fluoridation types) was also significantly positively correlated with state prevalence of ADHD for all but one year examined. [...] The relationship between fluoride exposure and ADHD warrants future study.
Still, it will be interesting to see what more comes out of this.