IMAGE DISTRIBUTED FOR CREST ORAL-B - Safeway shopper Junko Tanii reacts to how much plaque is visible on her teeth when using the technology available at a Crest® and Oral-B® Pro-Health® event in Petaluma, Calif. on Wednesday, April 10, 2013. Crest and Oral-B are hosting the three day event to help educate people on the plaque that may be left behind. (Alison Yin/AP Images for Crest Oral-B)

Associated Press
IMAGE DISTRIBUTED FOR CREST ORAL-B - Safeway shopper Junko Tanii reacts to how much plaque is visible on her teeth when using the technology available at a Crest® and Oral-B®  Pro-Health® event in Petaluma, Calif.  on Wednesday, April 10, 2013. Crest and Oral-B are hosting the three day event to help educate people on the plaque that may be left behind. (Alison Yin/AP Images for Crest Oral-B)
IMAGE DISTRIBUTED FOR CREST ORAL-B - Safeway shopper Junko Tanii reacts to how much plaque is visible on her teeth when using the technology available at a Crest® and Oral-B® Pro-Health® event in Petaluma, Calif. on Wednesday, April 10, 2013. Crest and Oral-B are hosting the three day event to help educate people on the plaque that may be left behind. (Alison Yin/AP Images for Crest Oral-B)
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