Smokers' teeth discolor more than others, usually. But the stains lie in a film and removing that film removes them.
Clearly, there was widespread knowledge of the negative effects of smoking on breath and teeth. Many cigarette brands attempted to ease public concern over these side effects, while, as in the case of this advertisement, some non-tobacco products reassured smokers that they could still smoke any brand they wished and maintain a healthy, attractive mouth. This toothpaste ad claims that “dental science has evolved” in to a “new dental era” and can now combat “tobacco teeth.”
Dentist, Male, Tooth Paste