The chewing of sugarless gum increases the flow of saliva, which washes away food and other debris, neutralizes acids produced by bacteria in the mouth and provides disease-fighting substances throughout the mouth. Increased saliva flow also carries with it more calcium and phosphate to help strengthen tooth enamel.
The only varieties of gum the Lasky Pediatric Dental Group recommends are the sugarless type . They are sweetened by non-cavity causing sweeteners such as aspartame, xylitol, sorbitol or mannitol. Of course, chewing sugar-containing gum increases saliva flow too, but it also contains sugar which is used by plaque bacteria to produce decay-causing acids. Further research needs to be done to determine the effects of chewing sugar-containing gum on tooth decay.