• Safe and healthy material: the jaw muscle trainer is made of food-grade silicone, non-toxic, odorless, eco-friendly, and safe. It allows you to use them safely. • Perfect effect: the jaw exerciser can tone and tighten the underlying facial muscles to help reverse the signs of aging. Exercise your facial muscles to reduce sagging, fine lines, and smile lines and look younger and better. • Suitable for all face shapes: our jaw muscle trainer is designed as a universal fitness tool to fit any face shape. It is not just a product to reduce double chin, it is a complete facial trainer for men and women. • Easy to use: before using our jaw training exercises, put it in hot water at 80 degrees for 20 seconds, take it out and put it in your mouth for 15 seconds, stick with it for 15-30 minutes every day, activate your facial muscles. Additionally, with the hands-free design and the necklace, you can use it anytime and anywhere. • Use in multiple scenarios: our jaw muscle trainer is lightweight and portable, easy to carry. You can use it at the gym, in the car, at the office, or while watching TV. It is suitable for men and women.