I get my retainer in a few days. I'm worried that my bite will just go back to the way it was, which was top overlapping bottom. What's to stop it from moving back? Or does the alignment of teeth force it to stay in place?

Does the retainer hold the top and bottom jaw in place or just the alignment of teeth? And what happens when you are done wearing the retainer after a year, wouldn't it just start moving back from there or does your teeth and alignment stay after 1 year of staying in place or something?

The overall question is: What's stopping the jaw and teeth from moving back after retainer wear?

Further info: The orthodontist recommended me take out two upper teeth but I refused at last minute, because my teeth are apparently overcrowded.

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