I have really long hair, but it has gotten pretty damaged over the years from bleaching and straightening. Have any of you had this problem? How much would I have to cut it for it to look good again? The damage goes really high up :(
The only way is to cut off all the damaged hair. This hasn't happened to me even though I dye it a lot but I manage to keep my hair healthy despite that. A hairdresser will be able to determine how much will need to be cut off.
Sadly, you have to cut all the damaged hair. If not all at once, then once every month until the damaged part goes away. Take it as a lesson and start taking better care of your hair. Avoid heat tools and bleaching