Hair coloring and heat styling can make your hair look polished and beautiful, but repeated exposure to bleach, dyes, straighteners, curling irons, and blow dryers can weaken the hair shaft. Over time, you may notice dryness, roughness, frizz, split ends, dullness, or increased breakage. If you are wondering how to repair damaged hair, the key is to reduce further damage while improving the hair’s moisture, strength, and manageability.