Features One of the biggest reasons why many people donu2019t have the jawline theyu2019d love to have is that the jaw just didnu2019t develop enough when they were young. This is often because they didnu2019t chew enough hard foods. This is common in our age of processed dietsu2013our jaws arenu2019t as large as those of our ancestors, and thatu2019s why most of us have our wisdom teeth removedu2013thereu2019s not enough room for them. Functionally, the jaw exerciser is pretty straightforward. Itu2019s a silicone ball that molds to your teeth. You simply bite down on it for exercise. The company says the ball offers 40 or more pounds of resistance, depending on which model youu2019re using. Their recommended routine is 20 to 30 minutes per day, every day. They say you should see changes within 30 minutes. How to use Just chew on it for as many reps and as long as you want. Specifications Material: Non-Toxic Silicone 15 LB Main Use: Slimming & Toning 30LB Main Use: Sculpt & Strengthen Whatu2019s in the Box 1 x Jaw exerciser