CINCINNATI–Oral-B and Crest have begun what a statement from the two brands described as a “cross-country crusade” to educate people on how they can improve their oral health.

The initiative from the two Procter & Gamble brands, titled “4X Cleaner Crusade,” will spotlight how the use of the Oral-B electric toothbrush and Crest toothpaste can reduce plaque on teeth better than using a manual toothbrush and anti-cavity toothpaste. As part of this effort, Oral-B and Crest will visit St. Louis and Philadelphia, cited by Men’s Health magazine as “the two worst-teeth cities in America,” the statement said.

On these visits, the two brands will show people how much plaque is left behind on their teeth through a digital plaque-imaging system. A dental professional will also answer questions and provide free dental advice to participants.