Advantages of Jaw Exerciser: The jaw exerciser is suitable for men and women of all ages. The jaw exercise ball can train over 57 facial muscles, tighten your skin and improve your appearance by simultaneously increasing blood circulation to your face, cheeks, neck and head. Therefore, you can achieve a defined jawline, firmer face, confidence and youthful appearance. Exercise Your Jaw Anywhere: The exercise ball is small and light, easy to carry. The attached lanyard allows you to carry your jaw trainer with you. You can use it anytime in the gym, at home or at work. Use the double chin reducer for 15-20 minutes a day to reduce your double chin. Safe Material:This facial exerciser is made of food grade silica gel, which is elastic and not easy to deform. It contains no chemical loading and is safe to chew. It is durable and lightweight, suitable for men and women of all age groups. How to Use:Before first use, please put the ball in boiling water for 15-20 seconds to sterilize. Put it in your mouth after rinsing. Then gently bite down on the white strip. After one use, rinse with warm water and keep dry in the ball case (included) for next use.