Studies show that without retainers straight teeth can gradually shift back towards their initial position.
This is a common occurrence following all orthodontic treatment, but is one that can easily be overcome. Wearing retainers after traditional braces or Invisalign treatment means you are keeping your teeth in their new position and protecting your smile and investment.
Another potential advantage of a removable retainer is that you can take it out and brush and floss your teeth with ease, which is more of a challenge with a permanent fixed retainer.