If you have been told that you are not a candidate for Invisalign, even after asking for this treatment option, then you should get a second opinion. This should preferably be from an orthodontist that has a significant amount of experience with Invisalign. The reason is simple. Virtually all cases, no matter how difficult, can be treated with Invisalign. So, why are patients still told they can't use Invisalign, and must instead wear full braces for their entire treatment? We have broken this down into the following reasons, based on patient interviews presenting for second opinions.