More than 60 years after disrupting the oral care category with the first fluoride toothpaste, Crest says it is out to reinvent brushing again with new Crest Kids Color Changing Toothpaste. The formulation is designed to encourage kids to brush up to two times longer to protect against cavities. The color-changing technology transforms the bubblegum-flavored toothpaste from blue to pink after two minutes of brushing, according to Crest, which is owned by Procter & Gamble. To celebrate...