I left my retainer out for 5 months and only got my braces off about 1.5 years ago. My teeth still look relatively straight, but have moved slightly. When I try to wear them for a full night I wake up during the night from the pain. Do I bare the pain and try to get the retainer fix them back if that’s possible? Is it possible for a retainer to move teeth back? And will the pain stop if they do move back?