Truth: Wearing your retainer keeps your teeth straight.
Unfortunately, teeth don't just get straight and stay straight. Even after you have braces or Invisalign, your teeth can shift around and "become crooked again," Roberts explained. If that happens, you might find yourself shelling out for another round of orthodontics to straighten them out again. That's why your retainer is so important: when you wear it as your orthodontist recommends, it can help your teeth stay set in their new positions.