In fact, the simplest thing is that if you touch the mirror every day and feel that you are laughing to a good degree, you can keep it like that, keep it like that in front of the mirror, and gradually you can laugh well without the help of the mirror, and then look in the mirror to see if you look good. This is how to keep in touch repeatedly. If your mouth is not good, you can clamp it with chopsticks, which will make your mouth round. I type one word at a time.