Funny that you ask, I just went yesterday to have the impressions taken for Invisalign braces. I had traditional braces when I was younger, however, my retainer broke around six years ago and I never had it replaced. As a result, my teeth, especially the bottom set, have started to shift back to their original crowded positions. From what I have read, your bottom jaw continues go grow and change until the age of 23, so this is a somewhat common complaint even from those who have worn a retainer. Minor corrections such as this tend to be excellent candidates for Invisalign braces. They aren't really recommended for children though, maybe because they don't apply as much pressure as traditional banded braces? I'm not too sure on that one, but it would make sense. To adjust your teeth, you receive a series of "braces" that you wear for a specified period of time until you are ready to move on to the next set. Basically, they are just clear plastic retainers that you go through, each series providing the next set of adjustments, until your teeth are back into alignment. You have the convenience of taking them off when you need to, but I imagine it would be beneficial to keep them in as much as possible. Probably would help decrease the length of treatment as well.
I am having the procedure done through the University of Florida dental school, which I believe is substantially cheaper than going to a private orthodontist. You have two options, having the faculty complete the treatment, or the graduate dental students. Obviously, having the students do the work is the cheaper option. I believe the costs were $4400 for faculty and $3000 for the graduate students. The treatment received between the two is supposed to be identical, since the faculty is right there supervising the students. The main difference is the length of time the appointments take. I chose to have the Invisalign done by the students, and, for example, it took the girl 4 tries to get proper impressions of my bottom teeth, where as it might have taken the faculty only 1 or 2 tries. I didn't feel that it was worth spending an extra $1400 or so just to save a little time. If you are near a college or university with a dental program, it might be worth checking to see if they accept patients. Although I am a student at UF, they accept anyone for treatment.
After I had the impressions taken yesterday, they said that I should receive the first set of braces by mid January. They expect the total length of the treatment to last less than a year. Once I actually get started with the braces, I can report back and let you know how it is going.