Is Chewing Gum Better Than Flossing? Chewing gum’s got a bad rep, and perhaps deservedly so: It’s a vulgar habit of the ill-mannered, it rots your teeth, and there’s nothing more disgusting than reaching under a desk and touching a petrified blob of chewed-up gum. Fed up with wads of gum being discarded everywhere and the costs associated with its removal, the Prime Minister of Singapore banned chewing gum in his country in 1992 (although you can chew it if you have a prescription from your doctor).