Straightening your teeth with an orthodontic treatment like braces or Invisalign can give you a beautiful, healthy smile for life! That is, as long as you wear your retainer as instructed. If you weren’t diligent about wearing this small but important orthodontic appliance, you may find that your teeth aren’t as straight as they once were! Can you simply wear your old retainer to restraighten your teeth? The answer is complicated, and making the wrong choice can cause serious damage to your teeth. Read on as we go over whether or not your old retainer can help you regain your straightened smile.