Is it bad for your teeth to chew gum?

No: It is actually good for them as long as it is sugar free.

Sugar free: If chewing gum find sugar free gum that doesn't stick to dental work. Xylitol (a natural sweetener) gums are good. Chewing a stick of gum after a meal can help saliva production which in turn cleanses the mouth. There is some evidence to suggest that gum chewing stimulates tissue, much like massaging.