I've heard rumors that he wore Invisalign, but I have no concrete proof for you, sorry.
Yes he does, you can watch I video (he is showing them)
I heard he does. I'm pretty sure I saw an article about it once. Invisalign is pretty nice though. My wife did that to straighten her teeth and you could hardly even notice them.
What is Invisalign? Lol sorry , you are the one asking the question. But I don't know much 'bout him.
I saw a video of him putting in invialign. Just look up on google does justin bieber have invialign and go to videos.