Orthodontics treatment is not permanent on its own. When someone finishes treatment, their orthodontics provider gives them retainers that you have to wear full time for 6 months and then only at night for as long as you want to keep your teeth straight. The longer you wear your retainers, the longer your teeth will stay straight. The only way to guarantee your teeth stay as straight as possible is by wearing your retainers. That means night-time for life-time.