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08/16/2012 at 05:00 PM ET

julia roberts 300x400 How Baking Soda Fits Into Julia Roberts’s Beauty RoutineJackson Lee/Splash News Online

Julia Roberts received one of her best beauty tips ever from her grandfather.

“I brush [my teeth] with baking soda,” she tells InStyle in the magazine’s September issue. “[My grandfather] would put a big heaping mound of it on his toothbrush. He