2. Raise your head slowly, look at the sky, then open your mouth and send it up with the tip of your tongue, and hold for 10 second; Then retract your tongue, close your mouth, and slowly lower your head. Repeat 10 times to reduce the fat in the mandible. 3, the mouth is slightly open, and the jaw moves left and right, repeating about 30 times. Just do it 2-3 times a day.