Material: Jaw exerciser and neck toning tools made of food grade silicone to ensure safety. The polyurethane bite strip allows you to customize your mouth, allowing you to easily adjust the shape and oral cavity. Effect: Jaw trainers and neck toning devices tighten and tighten jaws facial muscles below to reverse the signs of aging. Trains facial muscles to reduce puffiness, wrinkles and smiles, looks younger and better. Reduces Hunger, has been shown to reduce cravings, leading to greater weight loss. Is for those interested in health and fitness who want to create a more muscular look and younger. It's the hands-free call anyone can make. May be applicable: younger, tighter face, increased metabolism, increased hair growth, stress relief, increased levels of human growth hormone and the end of oral fixations to name a few. Lightweight and Convenient: Chewing jaw exercises have been shown to reduce cravings and lead to greater weight loss. Comfortable and easy-to-carry hands-free exercises can be used when you go out, at the gym, at work and anywhere.