What does Denham’s represent? Denham's Dentifrice is an advertisement that is used to demonstrate this

Montag can't handle the mindless drone of advertisements coming over the subway. He is trying to read about important things like truth, he doesn't want to hear about toothpaste. This one is a jingle for Denham’s Dentifrice toothpaste. He gets up waving his book around and screams at the speaker.