First, chin fuck-you can tighten your chin.
1. Shut your mouth and move your chin to the right as far as possible.
2. Move to the left in the same way. Do eight groups at a time.
Second, grinding teeth-can eliminate the relaxation of the neck and double chin.
1. Try to open your mouth horizontally and slowly to the bottom, and then stop 10 seconds.
2. Just close your mouth and grind your teeth hard, and don't stop hard 10 second. Repeat the above set of actions for 8 times.
Third, tongue practice-make the lines of chin and neck more perfect.
1. While pressing your chin with your fingertips, push the tip of your tongue and stick it out as far as possible.
As long as you move your tongue to the lower left, the muscles in your mouth will become hard.
3. Start to rotate to the right, and turn in circles as a set of actions, and repeat for eight times.
Suggest a try. . . .