My hair looks so brittle why?

I wash my hair everyday but with only conditonar i only wash with shampoo two times during the week.the hair on my scalp look healthy but the rest of it looks brittle ad its not split ends what can i use on my hair that well make it look healthier.by the way my hair is curly loose curls naturaly ..but i got a perm for the first time and it messed my hair up what should i do