Are you one of those people who is known for always chewing gum—at home, work, everywhere? If so, you may have wondered if your habit is causing any long-term damage to your teeth and jaws. Based on what is currently known, there is no real evidence that chewing gum is bad for your jaws. However, depending on the type of gum you are chewing, it may be bad for your teeth. If you chew gum, avoid those packed with sugar and instead select gum that contains Xylitol, a special sugar alcohol that not only tastes sweet but also inhibits the bacteria that cause decay.