Water fluoridation is the process of increasing the concentration of fluoride ions in drinking water to reduce the incidence of tooth decay. Dentists and public health experts find it very helpful for reducing tooth decay. Fluoride ions in drinking water partially convert apatite to fluoroapatite in tooth enamel, making it more resistant to acids produced by bacteria.
Raving lunatics see water fluoridation as "Communist infiltration, Communist indoctrination, Communist subversion and the international Communist conspiracy to sap and impurify all of our precious bodily fluids."
The below poster from May 1955 from the Keep America Committee claims that water fluoridation is a communist plot.
You can see that they're also against polio serum, suggesting that they are in favor of polio for some reason.
"Down with water fluoridation!"
"Down with polio vaccination!"
"Bring back the iron lung!"
But if that isn't enough conspiracy theory for you, the National Museum of Dentistry in Baltimore, Maryland, USA has a home water fluoridation system that was installed around 1960 in the home of Attorney General Robert F. Kennedy.
Below is a picture of the fluoridator and my transcription of the explanatory placard. This is only marginally connected to the theme of these pages, but it's my call. It's unusual plumbing that I have seen, plus a tie-in to amusingly nutty conspiracy theories.
This prototype apparatus to fluoridate a home water
supply was installed around 1960 in the home of
Attorney General Robert F. Kennedy in McLean, Virginia.
The Kennedy household was selected for the trial
because of the number of small children whose teeth
would benefit from fluoridated water. The devices was
found to be inefficient and difficult to maintain.
Gift of Centers for Disease Control and Prevention.