Normally we think of quackery as involving radioactive toothpaste or electric colon warmers, but this 1937 ad for Listerine shows you can find quack uses for legitimate products too. Love the image of the nurse massaging Listerine into the subject's scalp. I'm glad they have a doctor and bank of reporters standing by just in case he turns into The Scalp that Ruled the World (echo...echo...echo...).
