I've done it several times in my 4 months (currently) in braces. It was always the bottom wire; for a while I had two wires (!) on the bottom, and I still managed to bend one! I could tell right away that something was up, because my front teeth felt weird...
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Anyway, if you got it back in, I don't think you have much to worry about...I confessed to my ortho, and he said that the beginning, thin archwires are much more likely to bend (and I don't think there's any way I will be able to bend the thicker one I got yesterday!) and no harm, no foul. Of course, if it'd make you feel better and everyone has the time (or if you think it still feels weird in there), pop on in for a look-see. (Beware the crunchies...and overly large pieces of apple
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