How to Treat Damaged Hair | Repair That Actually Works

For the full breakdown, see our best Damaged Hair Treatment Products guide.

The honest answer on how to treat damaged hair is that you can’t undo a split shaft. Once the protective outer layer breaks and the fiber splits, no product glues it back together. What you can do is stop further damage and strengthen the healthy length that remains. That two-part job is the real treatment, and it starts with how you handle hair in the shower and with heat.

Step One: Stop the Damage Before Anything Else

No treatment works while you keep damaging the hair faster than it recovers. The American Academy of Dermatology and other sources are blunt about this: reducing heat, chemical services, and rough handling is the foundation of repair.

• Cut heat drastically. Air-dry when you can. If you must blow-dry, use the lowest heat setting and keep the time short. Always apply a heat protectant before any hot tool touches your hair.
• Pause chemical services. Bleach, dye, perms, and relaxers are the biggest structural culprits. Let hair recover before your next appointment.
• Handle wet hair like it’s fragile, because it is. Wet hair stretches up to 30% more and breaks far easier than dry hair.
• Space out color. If you must do multiple services, perm or relax first and color two weeks later.

Daily Washing and Conditioning: Fixing the Routine

Most washing routines make damage worse. The fix is a simple swap: shampoo the scalp, condition the lengths, and use cooler water.

• Shampoo only the scalp. Let the suds rinse down through the ends. Scrubbing the lengths strips the few natural oils they have.
• Conditioner goes on the mids and ends, not the scalp. Rinse-off and leave-in formulas both help; apply them mainly below the ears and let them sit.
• Use lukewarm water, never very hot. Hot water opens the cuticle and strips moisture faster.
• Adjust washing frequency to your hair type. Oily hair may need more frequent washing; dry or chemically treated hair needs less. Over-washing dry hair is a common mistake.

Washing correctly is the daily layer of treatment. The weekly layer is a deep conditioner or mask.

Deep Conditioning and Weekly Masks

A weekly deep treatment adds moisture and temporary strength while you grow out the damage. Timing varies by product, but most guidance lands between 10 and 30 minutes of leave-on time.

Rinse with warm water and blot dry gently. Product labels often suggest longer times, and some sources recommend 20 to 30 minutes—follow the bottle. For extra impact, apply a pre-shampoo treatment to damp hair for 5 to 10 minutes before you wash, then shampoo and condition as usual.

Drying and Detangling Without Breaking Hair

The way you dry and comb hair causes a shocking amount of damage. The fix is gentler friction and smarter tools.

• Blot, don’t rub. Rubbing wet hair with a towel shreds the cuticle. Use a microfiber towel or a soft T-shirt and squeeze sections gently.
• Detangle with a wide-tooth comb while hair is damp. Start at the ends and work up. Avoid brushes on wet hair when possible.
• Use silk or satin pillowcases. Cotton pillowcases create friction that breaks hair overnight. Loose ties and clips are gentler than tight elastics.

The only true repair for split ends is cutting them off. Regular trims prevent splits from traveling further up the shaft, which is why stylists recommend them every 6 to 8 weeks during recovery.

If damage is severe, or you notice hair loss or scalp symptoms, see a healthcare provider. They can rule out underlying conditions like thyroid issues or nutritional deficiencies that affect hair health.