The Twilight Saga star and Invisalign hosts BooBoo Stewart and his big sister Fivel got to ask all their famous friends, like Sarah Hyland and Victoria Justice, to show off their megawatt smiles at this year's Teen Choice Awards. Check it out:
SEE IT: BooBoo Stewart Does Lopez Tonight's "Twilght's Got Talent"
Which star has the best smile? Comment below and let us know!