A3. "A toothbrush endorsed by a dentist is sure to be good" A3. "A toothbrush endorsed by a dentist is sure to be good" Here we see some circular reasoning incorporated into the advertisement. In defending and promoting dentistry, the ad turns to the profession in question for its own defense. This is one of the first and finest examples of self-promotion during the earliest years of advertising the Pro-phy-lac-tic tooth brush.

A3. "A toothbrush endorsed by a dentist is sure to be good" A3. "A toothbrush endorsed by a dentist is sure to be good" Here we see some circular reasoning incorporated into the advertisement. In defending and promoting dentistry, the ad turns to the profession in question for its own defense. This is one of the first and finest examples of self-promotion during the earliest years of advertising the Pro-phy-lac-tic tooth brush.