1073: Fluoride | Skeptical Sunday

Early Research

The early research into fluoride began with a peculiar dental condition known as "Colorado Brown Stain," observed by dentist Frederick McKay in the early 1900s. This condition, characterized by brown stains on teeth, was initially thought to be caused by dietary habits but was later linked to high fluoride levels in the local water supply 1. McKay's investigations revealed that while the stains were unsightly, the teeth were remarkably resistant to decay, sparking further research into fluoride's benefits 2.

McKay's research showed that the stained enamel was rooted in childhood, and the weird thing is that Colorado brown stained teeth were surprisingly and just inexplicably resistant to tooth decay.

--- Jessica Wynn

This discovery laid the groundwork for understanding fluoride's role in dental health, eventually leading to its controlled use in water supplies to prevent cavities.

   

Adoption

The adoption of fluoride in community water supplies began with the United States Public Health Service's interest in McKay's findings. They investigated similar cases in Bauxite, Arkansas, where high fluoride levels were linked to aluminum manufacturing byproducts 3. This led to the realization that controlled fluoride levels could prevent tooth decay without causing staining, prompting Grand Rapids, Michigan, to become the first city to fluoridate its water in 1945 4.

When the research took off and fluoride studies were finally being done by the NIH, the Dental Hygiene Unit, their first task, starting in 1931, was to just to develop an accurate way to measure fluoride in drinking water.

--- Jessica Wynn

This marked the beginning of widespread fluoridation, significantly reducing cavity rates and transforming public dental health.