Is It Possible To Restore Dead Hair ?

help! i have overprocessed my hair. I have colored it, permed it and colored it again and now it is long and well...dryed out and dead looking. I deep condition it and that helps at the time and put in a leave in conditioner all day, but still when i get out of the shower..my hair is so dry, its already dry when i take the towel off? i use deep moisture shampoo and condtioner but honestly dont know if i can save it or if its even possible to "restore" damaged hair as lots of ads claim. Do i have to cut it all of and start over? I LOVE long hair!