Olaplex saved my hair! I started using it around a year ago after my hairdresser practically wept at the sight of my weak, brittle hair. I had lone been torturing it with heat products and over bleaching.
I used a small bottle over the course of a few months, spreading it through damp hair and then sleeping in it over night (the longer, the better I say!) Now my hair is strong and the longest it has been in yeaaaars.