FeaturesOne of the main reasons many people don't have the jawline they wish they had is that the jawline simply didn't develop enough when they were young. This is often because they haven't chewed enough hard foods. This is common in our age of transformed diets; our jaws are not as large as those of our ancestors, and that is why most of us have our wisdom teeth removed there is not enough room for them. .Functionally, the jaw exerciser is quite simple. It is a silicone ball that molds to your teeth. You just bite on it for exercise. The company claims the ball offers 40 pounds of resistance or more, depending on which model you use. Their recommended routine is 20-30 minutes a day, every day. They say you should see changes within 30 minutes.How to use itSimply chew it for as many reps and for as long as you want.SpecificationsMaterial: Non-Toxic Silicone15 LB Main Use: Slimming & Toning30LB Main use: Sculpt & StrengthenWhat's in the box1xjaw exerciser