This is still related to my mood. I frown when I am in a bad mood or nervous. The teeth are closed and the face is naturally stiff.

In a normal mood, there is generally a gap, a 3 mm gap? Looks like I didn't. Maybe I'm a little more depressed than you, huh?

If you are in a good mood, you will always laugh, and naturally the gap between your upper and lower teeth will be big.