It's no use changing it. In your case, labial frenum is too persistent to laugh and lift his upper lip. You can go to the hospital for a labia minora lacing operation. According to what you said, it shouldn't be the ground covering the sky. You can make sure that your teeth bite into an O shape, but the upper front teeth can't bite down. Let's see if this is the case. If not, it is the situation I mentioned above. Excessive attachment of labial frenulum