A point on Invisalign that I haven't seen made is that the procedure is only appropriate in cases there the orthodontic work is fairly minor. I have personally been treated with the Invisalign procedure, and was quite pleased with the results, but in cases where teeth must be moved long distances in or out, or moved very far up or down, or rotated about their center axis, my orthodontist says that Invisalign is not an option. That will reduce the number of potential patients accordingly.