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Associated Press
IMAGE DISTRIBUTED FOR CREST AND ORAL-B PRO-HEALTH - Crest® and Oral-B® Pro-Health® helps educate Ruth Williams on how much plaque may remain on her teeth even after brushing at an event at Walgreens in Chicago on Friday, May 24, 2013. Crest and Oral-B are hosting the three-day event to help educate people on how they can achieve better oral health in 2013. (Peter Barreras/AP Images for Crest and Oral-B Pro-Health)

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