Our jaw trainer is made of food-safe organic silicone to ensure safe use. The chew part can be disassembled and cleaned. It is not a disposable product and can be reused after cleaning. Our lower jaw training device is an ideal tool for lifting and toning the lower jaw. Training eliminates fat deposits around the chin, cheeks and neck and promotes toning of the facial muscles, thus contoured your face. Lift the muscles and shape the perfect facial line. The jaw trainer trains and stretches the muscles of the face and neck, reducing the double chin, strengthening the chin and achieving a perfect and natural smile. How to use_To fit, first practice placing product and get the feel for how wide you should open your mouth. Put product with biting strips in billing water for 20-24 seconds. Remove jaw exerciser from boiling water, shake off excess water, but don't wait too long to let it cool. Stick your thumbs through the whole, place and adjust jaw exerciser so you are biting down on bite strips. Bite down and hold for 15 seconds to customize the mouthpiece to the contours of your own mouth. Remove product from mouth and cool your imprints under cold water for a few seconds to permanently set imprints.