Using products packed with protein is the first thing that springs to mind - however in this case you may have overdone the protein on top of severely damaged hair - making the hair even more brittle. Because of the intensity of protein on the hair it isnít recommended for long-term use and should be reviewed at this point. I would thoroughly recommend using Kerastase Nutritive range, which is intensely moisturising without protein. I Would definitely recommend a cut as well, split ends can worsen over time if they are left. The more you can have cut, the better. ...More >
After 6 weeks move back onto a repair programme: Use the Kerastase Resistance Bain Force Architecte (shampoo) and Ciment Anti-Usure (conditioner) for every wash, and the Electric Intensive Treatment Masque every 7 days. If you blowdry or use other heated styling tools I would highly recommend the use of Kerastase Resistance Ciment Thermique. If you do not use heated styling tools, the Elixir Ultime moringa immortel (Green) would be the recommended product, it is designed to condition damaged hair and can be used on wet or dry.
Give this programme 12 weeks and with regular trims your hair will be tip top in no time!