Fixed or Permanent Retainers are glued to your teeth and stay inside your mouth. They are often placed on your lower or upper ...

Surprisingly, I found them extremely simple to set up at home — and some were even as comfortable as my Invisalign retainers ... to fit either upper or lower teeth. Which one to buy largely ...

I have a permanent retainer on my bottom set of teeth ... Treating just the upper or just the lower set of teeth can create alignment issues in the long-run, but wasn't personally an issue ...