How To Fit Your Jaw Exerciser? 1. To fit, first practice placing Jaw Exerciser and get the feel for how wide you should open your mouth. 2. Put Jaw Exerciser with biting strips in boiling water for 20-24 seconds. 3. Remove Jaw Exerciser from boiling water, shake off excess water, but don't wait too long to let it cool. 4. Stick your thumbs through the hole, place, and adjust Jaw Exerciser so you are biting down on bite strips. 5. Bite down and hold for 15 seconds to customize the mouthpiece to the contours of your own mouth. 6. Remove Jaw Exerciser from the mouth and cool your imprints under cold water for a few seconds to permanently set imprints. Features: Enhance Your Jawline - Look Younger and Better With A Chiseled Jawline Slim, Tone, and Tighten Your Face and Neck Quickly, With Revolutionary, Patented Technology Convenient, Hands Free Workout - Keep With You, to Use On the Go, At the Gym, At Work, Wherever Reduce Cravings - Chewing Has Been Shown to Decrease Cravings, Leading to More Weight Loss The Jawline Fitness Ball & Facial Toner is a face exercise product that helps strengthen and tone your facial muscles. Get a more defined face and bring back your youthful look. All it takes is 10 minutes a day to start seeing a difference. With enough training, rest, and nutrients your facial muscles will grow as any other! Description 100% brand new, high quality Material: Silicone Size: One size Color: Black, Blue, Red, Green, Purple Package Included: 1 x Jaw Exercise 1 x String 1 x Box 1 x Instruction