he number of calories burned is actually very small, something like twenty to thirty calories per hour; you would do better eating a fibrous vegetable like celery or even apples.
A chewing gum can burn up to 50 calories when chewed for an hour. If you want to improve the calorie burnt, then you can add more chewing gums in your mouth
You burn about 8 calories an hour by just casually chewing gum in your mouth. But you have to remember that the piece of gum also has calories so you're mainly just burning the piece of gum off.