Historically speaking, chewing gum has been made out of many different substances. In fact, some of the earliest chewing gums were simply tree resins or unrefined sap that was semi-hardened.
How Many Calories Does Chewing Gum Burn Per Hour?
Why Do Athletes Chew Gum While Playing? » Science ABC
Is Chewing Gum Good or Bad For Your Teeth & Overall Health
Schema of jaw and neck muscle coordination while chewing gum on
Can chewing gum while studying boost your performance
Does Chewing Gum Make You Bloated? What Causes Gas Pain
Chew Chew! Chewing Gum Can Prevent Cavities - Beautiful Smiles
Surprising Dental Health Benefits of Sugar-Free Gum - Dental Depot
Chewing Uses More Energy Than You'd Think
The Secret Science of Gum - American Chemical Society
Can chewing gum really clean your mouth? — New Town Dental Care
Chewing Gum for Weight Loss: Does It Work?
The Chewing-Gum Workout Plan