Chewing extra-hard gum likely won't result in the chiseled jawline that young men may seek, experts say, and it could damage jaw joints and teeth. The most recognized among the few brands of ...

"Extra-hard" chewing gum is being touted on social media as a means of developing a chiseled jawline. This sort of gum is promoted as a gym for "facial fitness," toning and tightening the muscles ...