francesca thank you, as always. elizabeth warren putting the old controversy over her native american heritage back in the spotlight once again. could she potentially be neutralizing what would be donald trump's best attack against her? >> i did the pocahontas thing, i hit her really hard and it looked like she was down and out but that was too long ago. i should have waited. but don't worry, we will revive it. more minerals enter deep into the enamel surface. you have an opportunity to repair what's already been damaged. it 's amazing.