A myth as durable as gum itself holds that the chewy confection sticks to your innards like it does to the bottom of a desk.
It's a moment nearly everyone has experienced. You're contentedly chewing a wad of gum when an unforeseen turn brings about a quick disposal—the hard way. Whether the cause is imminent detection by a high school teacher, a dearth of garbage cans or even an untimely hiccup, you gulp down the rubbery gob whole. It's only then that a refrain from childhood echoes through your mind: "Don't swallow chewing gum—it will stay in your system for seven years!" As the minty mass descends into your digestive abyss, you wonder: "Will I really be part Wrigley for years to come?"
Fact or Fiction?: Chewing Gum Takes Seven Years to Digest: Scientific American