One of my front teeth was very crooked, but it became completely straight around the 5th month, and now both the top and bottom are aligned!
Instead, it's non-extraction correction... The upper teeth are a little forward compared to the lower teeth, and they said to extract the two upper teeth to completely improve this. But... I'm uncomfortable with extraction of raw teeth, so I think I'll just do it like this ^^
I get stressed out about the alignment of my teeth when I smile or talk. If you get it, I highly recommend it. I slightly regret doing it when I was younger haha.