I've always had a terrible, dorky smile so I tend not to do it and just kinda smirk instead. In 6th grade we were having our photos taken for our school IDs, and I attempted a proper smile since that's what we were supposed to do. The photographer told me to knock it off or she'd tell a teacher (she thought I was intentionally making a stupid face). You know that photo of the awkward looking middle-aged white business guy captioned "Yes, I have a lizard up my asshole" or something like that? That's how I smile. My lips don't move properly, they just sort of stretch into a constricted oval around my teeth. I ended up not smiling at all for the picture.
Since then I've had literally dozens of people comment on the fact that I never smile. Every once in a while (mostly happened when teaching) something would catch me off guard and I'd manage one, and the usual comment wasn't that I had a nice smile so much as that I had nice teeth, and people previously assumed I had bad ones I guess.
