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Want to improve you oral health in 21 days? Join Listerine ® in their 21 Day Challenge starting today! What a great way to start the first Monday of February and you know it is the month of love and kisses so good oral health could benefit us all. When you sign up for the challenge, the Listerine Brand will make a contribution to help Oral Health America's Smiles Across America Program toward their goal of connecting 210,000 children in need of oral health services. How do I sign up?   This is the first day of the challenge so head on over to Listerine's Facebook page and click the get started button . This is a facebook app, which make signing up so easy. Then you will get a message that says Thank You, a donation was made to Oral Health America's Smiles Across America. Then read the page to see how you can have a healthier mouth. Listerine's Facebook page has all the information you need for the 21 day challenge, and scroll all the way to the bottom of their page f...