#TheyDidntKnow -|- "During the 1920 decade the mottled-enamel-dental-caries relationship was investigated by McKay and by Bunting and his associates -studies conducted during a period when the all-important factor, fluorine, was still unknown." 
"When I first reported on this subject, high amounts of fluorine in drinking water had only recently been indicated as the cause of mottled enamel, and the general concept that fluorine has a deleterious effect upon teeth was not easy to abandon. -\- But they did.
#TheyDidNotKnowAndTheyDidItAnyway. -|- "Thus evidence from three different fields shows that #fluorine acts in some way to reduce the prevalence of dental decay."
A decade+ later, they still didn't know.
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