One problem remains. This study points out that there might be a problem with "fluoride" in the water as numerous other studies have previously shown and, fluoride was recently and authoritatively declared a neurotoxin. Since there is the possibility of a  sinister impact of fluoride to any aspect of health, all health authorities should end fluoridation of all water supplies until proof of effectiveness and efficacy is obtained by independent, disinterested, non dental researchers and, Toxicology Studies and Clinical Trials should be performed to prove the safety of the use of the actual chemical mixture used in actual tap water after it is purified for drinking.
Let us also remember who has most to gain from the damage done to teeth by fluoride in water.
I contend that not only should fluoridation be ended, but that naturally occurring fluoride be removed in the source water for improved heath outcomes and a reduction of health care budget costs. Research will show you why.