We have been chewing gum for a very long time. It started with the bubble gum Basooka and the bubble blowing contests we would have for hours. Now it seems after more than 20 years of research, it has been found that when you chew sugar-free gum, you can protect your teeth. Good news.
http://www.wrigley.com/global/benefits-of-chewing/chewing-gum-and-oral-health.aspx