I am in sales, and am horrified. Remember, ALL nail treatments work from the growing part of the nail.
Nail tissue is dead tissue.
There is NO WAY to treat the already formed nail tissue. Let us know how you do. If you get started right away, it is possible that your new, healthy nail will get to where it is separating before the nail falls off. Transferred from my feet to several of my hand nails. I'm really concerned, because I use my hands in my work.