I had braces as a child, about 30 years ago. My teeth had moved over the years and I did not have the perfect straight teeth that I once knew. I wanted to have straight teeth again and did not want to wear regular braces. Invisalign gives me the flexibility of removing them when I do presentation in front of a group and do not appear when you wear them.
However, I was suppose to have the treatment for 12 months, and it was extended to another 12 months after that.
I only have 4 sets to go (about 8 weeks of treatment) and my teeth are better but not the perfect smile that I once knew. I find Invisalign is a usefull tool however not as effective as regular brces that I might have to wear for a few months anyway to finish the treatment.