Is your hair dry and dull? Do you have split ends and frizz? Hair is damaged easily, but it takes time to repair it. The good news is you can use the following techniques to restore its health to make your hair look better. Rescue damaged hair and practice habits that will keep your hair healthy.Sun exposure, chlorine, harsh chemicals in coloring, straightening and perming and heat stress from curling irons and blow dryers all conspire to make your hair porous, brittle, dry and dull. Although many stylists recommend snipping off damaged ends, you can take some steps to repair your damaged hair while keeping the length intact.