WATCH: PEN15's Maya Erskine and Anna Konkle reunite for a commercial

AHA Sparkling Water's new ad features Erskine and Konkle as themselves -- not as 13-year-olds. "It was really nice and interesting playing adults together," Konkle tells PEOPLE. "But it was weird not putting braces on before the scene. I remember being like, 'My little buddy, where's your bowl (cut)?'"