When I first got invisalign I was told that I would need them for 6-12 months. it has been close to two years now and I'm not even close yet. It isn't like I am not doing what I am supposed to.
I wear them all day. It is incredibly frustrating. My dentist keeps taking of my buttons and putting them back on and I'm getting to the point that I just want to say okay, that's enough, I'm done. They are painful and irritating. I'm so sick of them and have absolutely no idea when I will be finished where as if I had just gotten traditional braces I would be done in half this time.