It's been over a year since orthodontic treatment was completed, and I had 4 teeth extracted and had a protruding mouth corrected for 2 years and 7 months. My teeth are still not crooked as I corrected them, but my mouth gradually moves forward, perhaps because I didn't wear the retainer well in the beginning and my wisdom teeth came out. I hope you wear your retainer after the correction is finished. The hospital I went to was nice and friendly, but what about the new nurse? There were quite a few times when a dental hygienist came to see me for regular treatment, but perhaps because he was a beginner, there were a few cases where the wire pierced my gums and caused pain. It would be good to keep this in mind!