My crooked teeth are quite severe, so I'm looking into orthodontic treatment. I've seen a lot of talk about this place being a "master" for crooked teeth correction.

But I can't really tell if they're genuinely good or just advertisements. ㅠㅠ

When reading reviews, what else should I look for besides the before and after photos?

When I go for a consultation, should I ask right away if I need to have any teeth extracted?