Sometimes, when I'm just sittin' here, my jaw will spasm and I'll bite my tongue. Not a twitch from yawning or anything... so when I'm relaxed my teeth aren't held totally together and I guess my tongue is kind of large? Large enough that, slack-jawed but lips closed, it pushes a bit into the space between my teeth. (Is that normal? I've never closely examined anyone else's mouth)
Then my jaw muscles twitch, clamp shut, and I bite my tongue. It HURTS.

At least my teeth aren't as SHARP as they used to be--every so often the inside of my bottom lip would have cuts on it from rubbing against my teeth. Not biting my lip, no no! Just rubbing on them. Like dragging things across a shoddy knife. I hate my mouth.

@Edelwood yeah you're definitely some kind of reptilian cryptid, sorry

and I thought my "wisdom fang" was weird--one of my wisdom teeth came in as a canine. I had to have it extracted, I still kinda miss it...