☑️【Food Grade Material】: The chin strap is made of high quality food grade material to provide comfort and safety. Due to the material, there are no safety issues when using the product. Please be sure. ☑️【Effect】: The chin up training device can adjust and tone the muscles of the face through training, helping to reverse the signs of aging. It trains facial muscles, reduces sleepiness and wrinkles, and helps restore skin, firmness and youth. ☑️【Crack Reduction】: The chin up training device is your new secret weapon for face training. Put it in your mouth and bite repeatedly to train 57 muscles on your face and neck. Excellent results in just 20 minutes a day ☑️【Application】: Young and firm face, increase metabolism, increase hair growth, reduce stress, increase human growth hormone levels, and end oral fixation. ☑️ Jaw exercises are very practical for beginners. They can be used on the go, at the gym, at work and anywhere. If you want to make your face look firmer and firmer, please try some burnout exercises. Take a slow bite, hold the bite and release it.