Hardest chewing gum in the world We present the first fitness chewing gum specially designed to work out your jaw and hole facial muscles. Developed by the founder of JAWLINER® It's the hardest and toughest chewing gum in the world - from now on you just have to chew gum to get a strong and chiseled jawline. Get Back Your Strong Facial Features ✔️ Our jaw muscles are underdeveloped because of soft food. ✔️ Change that now, and train your jaw muscles! Unfortunately, the eating habits of modern society have changed in such a way that we almost exclusively eat soft food. That's why our jaws are no longer as pronounced as they used to be.