What does this mean?? (Picture is TMI bc it’s a close up picture of my two front teeth, not gross)

I don’t remember when I didn’t have these at the bottom of my teeth. I’m 27 if that helps with anything??

Like it’s not straight on the bottom of my top two teeth, as u can see. Idk what to call it haha. Thx in advanced for anyone who knows why my teeth r like this lol