Bishop’s campaign against drugs and alcohol centered on the idea of purifying the human body; so perhaps it is surprising that his abhorrence of addictive substances did not extend to medicine and other compounds. After fluoride was first introduced into a public water supply in 1945, Bishop defended fluoridation against criticism. He had worked with fluorine compounds, first while developing laundry detergent and later while working with hydrofluoric acid. He endorsed fluoride’s anticavity properties, adding that he used it in much larger doses than found in fluoridated water. This leaflet represents one of the rare instances where Bishop advocated adding chemicals to rather than subtracting them from the human body.