If you don’t know what Angry Birds is, your kids do. The online game has been downloaded more than half a billion times across all platforms since it launched in 2009—and now the brand is heading to the oral care aisle. Dr. Fresh Inc., maker of the FireFly toothbrush, has entered a new licensing agreement as the exclusive U.S. manufacturer and marketer of Angry Birdsbranded oral care products. The first of numerous products to be rolled out under the licensing arrangement wil...