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Heat damage has a particular look. The roots curl as they always did. Further down, the pattern loosens, and the last few inches hang straight, limp and slightly stringy, even when soaking wet. The hair has not been straightened temporarily. Its structure has changed.
It is better to be direct about this from the start: severely heat-damaged hair cannot be restored to its original curl. What follows will make damaged hair stronger, softer and better behaved, and it will protect the healthy hair growing in. It will not make straight ends spiral again.
What heat does
A curl holds its shape because of bonds within the proteins of the hair. High heat, particularly from flat irons and curling wands used repeatedly on the same section, breaks down those proteins and cracks the protective cuticle. Once the internal structure that formed the curl has been altered, nothing applied to the outside of the strand can rebuild it.
How to tell how bad it is
Wet a section thoroughly, with no product, and let it dry untouched.
| What you see | What it means |
|---|---|
| Curls return, but looser and frizzier than usual | Mild damage; likely to improve with care |
| Some strands curl, others stay straight | Moderate damage; partial improvement |
| Ends stay straight, with no bend at all | Severe; these ends will need cutting |
What actually helps
1. Stop the heat
For at least a few months, no flat irons, wands or hot brushes. If you must dry your hair, diffuse on the lowest heat setting. Damaged hair has very little tolerance left.
2. Add protein
Heat damage leaves gaps in the cuticle. Hydrolyzed proteins fill them temporarily, giving the hair more strength and, often, a little more curl.
3. Rebuild bonds
Bond-building treatments work on the internal links that heat and bleach break. They will not recreate a lost curl pattern. Many people find they improve the strength and elasticity of what remains.
4. Deep condition weekly
Damaged hair loses moisture quickly, because its cuticle no longer seals. Alternate a protein treatment with a moisturizing mask so that the hair does not become stiff. The balance is explained in Protein and Moisture.
5. Trim
Straight, damaged ends will not recover, and they tangle with healthy hair and split further up the strand. You do not need to cut everything at once. Many people trim half an inch to an inch every six to eight weeks and let the damage grow out gradually. Hair grows roughly half an inch a month, so the process takes patience.
Treatments improve damaged hair. Only scissors and time replace it.
Styling while it grows out
Hair with two textures is awkward to style. A few things help.
- Finger-coil the straight pieces. Winding damaged ends around a finger while wet encourages them to blend. See Finger Coiling, Step by Step.
- Use a firmer gel on the ends than on the roots.
- Choose styles that set a pattern, such as twist-outs, braid-outs or flexi rods, which give damaged and healthy hair the same shape without heat.
Preventing it next time
Heat does not have to be given up for good. It has to be used with limits.
- Always apply a heat protectant first.
- Keep tools at or below about 350°F for fine or already damaged hair.
- Make one slow pass, not several fast ones.
- Never use hot tools on damp hair.
- Treat straightening as an occasional event, not a weekly habit.
What to expect
With consistent care, mildly damaged hair often improves noticeably within six to eight weeks. Moderate damage improves partly. Severe damage is a matter of growing out and cutting off, which can take a year or more depending on length. It is slow, and it does end.