Banker & Nelie,
Although it is not possible to treat every case with "invisble" braces, many can be. Invisalign is the brand name for this technique and there are many dentists doing it. You can check this link to look for one near you
http://www.invisalign.com/generalapp/us/en/index.jsp Jim,
Although there are many that don't believe that chronic irritation can cause cellular changes leading to squamous cell carcinoma, I am one that does. Although I don't have and cannot find any scientific proof for this, I still believe it. Certainly it won't occur in every case.
Jerry