The invisaligners are definitely not invisible! Don't get them for that reason or you'll be disappointed.
I was supposed to wear mine for about nine months. After that I my teeth weren't much better. My orthodonist ordered more. Wore those for five more months. My teeth were a little better, but still not good. Now I have a new set of 10 (20 more weeks). If my teeth aren't straight by then, I quit. I wish I knew then what I know now. I would have gotten braces instead, and would have them off by now.