It would be best if you could upload you radiographs, but based on your description and photo, you appear to be a good candidate for Invisalign. If your #21 tooth root is showing signs of resorption, this is not ideal, but does not exclude you as a candidate for Invisalign. I suggest researching a top doc cosmetic dentist on this site and getting evaluated. It seems like you will be fine, but I would need to see x-rays and additional photos to make a definitive diagnosis. Good luck to you and I hope this helps. "Follow" me on Real Self to ask more questions of me.
Sarah Thompson, DMD
O'Fallon, IL and St. Louis, MO
YES you can be a candidate
Sometimes recession is a result of poorly aligned teeth. In my opinion and from just looking at this picture, I would recommend Invisalign for you and after completing your treatment I would like you to be seen by a periodontist who can help you with restoring the health of the gum.