It's either Listerine or...THE BELL.
(click ad, from 1946, via) This needs to be added to copyranter's most offensive sexist retro ads post. Sorry for the low res scan, but the copy starts: "Will the law ever require women who are careless about their breath to wear bells to warn others of their approach? It's not a bad idea." I agree! But let's make it a big fucking cowbell! Previously: Mouthwash spot via Indonesia features a man being killed by bad breath in a gas chamber.