I used it for about 2-3 weeks. my
nails became hard but then some of my
nails started lifting from the nailbed. Meaning the nailwhite is growing backwards and there is space between the nail and nailbed.
When I did the hardener treatment it used to burn a little (I thought that was normal, as the description mention minor burning).
I am letting my nails grow out and some got better but 2 are verry stubborn. I keep them clean and dry. I also try to clean between the space.