Features： 1、Promote facial muscle training, reduce double chin and improve jawline appearance. 2、Convenient cleaning, white bite strip can be removed freely, easy to use and no harm. 3、Shaping sliming face by removing excess fat from the neck and facial jaw area. 4、High quality food grade silicone, light and convenient to ensure safety and easy to use. 5、Can be used when reading, driving, cooking, fitness training or any other activity. Specification： Item Type: Jawline Trainer Material: Silicone Applicable Crowd: Face obese, face has no contour, face muscle aches Size: Approx. 3.5 x 3 x 3.8cm / 1.4 x 1.2 x 1.5in Function: 1. Make your jaw look strong 2. Reduce the appearance of a double chin 3. Activate facial muscles through the jawline exercise ball 4. Increase facial blood flow and oxygenation for a youthful appearance 5. Improve the appearance of the jaw line without plastic surgery Operating Instructions: Step 1: Place the jaw trainer in boiling water for 20-24 seconds Step 2: Cool, then place the jaw trainer in your mouth Step 3: Bite the center of the bar until the jaw trainer is comfortably in place Step 4: Release the bite and bite again, repeat for 15 times Step 5: Take a 1-minute break Step 6: Repeat this cycle 3-4 times a day, slowly increasing frequency as you feel strong Note: If you feel sore, take a day off Package List： 1 x Jawline Trainer 1 x Lanyard