Are my roots long enough for Invisalign? (Photo)

When I was younger my orthodontist said I wasn't qualified for braces as I had short roots on my two front teeth. I am 21 now and my ortho said that my roots are longer than what they appear on the x-ray and I can probably still qualify for orthodontic treatment. I will be starting Invisalign in the upcoming weeks. Based on the x-ray, would you say that my roots are long enough to have Invisalign treatment without compromising my teeth?