Unfortunately there is no way to undo the damage that has been caused. All you can do now is try to maintain the hair in the healthiest possible way. I would recommend no more chemical services what so ever. The hair needs to be treated regularly, once or twice a week, alternating with protein and moisture products. You should also trim your hair regularly (every 6-8weeks). Getting your hair back into a good condition is a process and is going to take time and patience. Products I can recommend to use on your hair would be Kerastase Bain Force shampoo and Kerastase masque force architecte as a protein and kerastase bain nutri thermique shampoo and the Kerastase nutrition thermique masque and or conditioner (conditioner for everyday use) for moisture. Masques must be kept on the hair for at least 15min. I would recommend a in salon treatment as well once a month. Either The Kerastase Vita Cement or Kerastase Concentre Oleo Fusion.