People have been chewing gum for various reasons. Some chew gum as a habit and others just want to feel less stressed. But the question is- Is gum good for your teeth? Generally, gums are considered safe. But dentists warn that chewing sugar-sweetened gum for a long period of time could be causing bacteria to infect your teeth that might lead to decay. On the other hand, sugar-free gums are useful for stronger teeth.