The noun commie has one meaning:Meaning #1: a socialist who advocates communism
Jan. 25, 1945: Fluoridation — Better Teeth, or Commie Plot?
1945: Grand Rapids, Michigan, becomes the first U.S. city to fluoridate its drinking water supply.
Fluoridation, implemented as a means of reducing tooth decay, involves adding one part per million of fluoride to the water supply. (The optimum level, according to the Centers for Disease Control, falls between 0.7 and 1.2 ppm.) Fluorine, of which fluoride is a compound, is one of Earth's most abundant elements, found in almost everything. In mammals, the highest natural concentration of fluoride is found in bones and teeth.