How do you smile?

I’m not asking how to smile, I’m asking how do you smile. :P

I’m not the best at doing a fake smile for the camera, which is why most of my school pictures look bad. It either looks way too forced or just kind of a half-assed smile. I’ve just never been good at it. The only time I smile in pictures is if I’m already happy and I’m always really nervous before school pictures.

I’ve noticed that some people either smile showing their top teeth, both top and bottom, or none. I wasn’t really aware of how I did it, but looking at photos seems to reveal the vast majority of the time I smile showing my top and bottom teeth. Maybe it’s goofy, but it’s what I do.

Are you good at fake smiling? Do you not show your teeth when you smile? Do you think a certain type of smile looks better than others?