The best way of getting rid of damaged hair is to actually cut the damaged parts of it and let it grow back.
But you can do a coconut oil hot hair oil treatment which sometimes helps depending on how bad the hair is damaged.
Warm up some coconut oil in a bowl of hot water by filling a bowl halfway with hot water and then placing a smaller glass container with the coconut oil in it into the bowl of hot water and the hot water will melt the coconut oil.
Then massage the melted coconut oil into your hair and leave it on the hair for up to 30 minutes and while it's on your hair put on a shower cap.
After 30 minutes comb your hair to smooth out the damaged hair and then wash your hair out with shampoo.
You can also use Apple Cider Vinegar to do an Apple Cider Vinegar rinse to fix damaged hair.
But if your hair has severe damage you might have to cut the damaged parts of your hair off and then let it grow back.