hair treatments · hair care
Keratin Treatment vs. Relaxer: What'sthe Difference?
Keratin treatment vs. relaxer compared by how each works, how long it lasts, damage, and safety, with what to ask a stylist before you book either one.
Hairover Team
A keratin treatment coats and smooths the hair, reducing frizz and loosening curl for a few months, then gradually washes out. A relaxer uses strong chemicals to permanently break down the structure that makes hair curl, so treated hair stays straight until it grows out. Keratin is a temporary smoothing service, and a relaxer is a permanent change.
Side by side
| Keratin treatment | Relaxer | |
|---|---|---|
| Result | Smoother, less frizz, looser curl | Straight |
| Permanence | Fades in a few months | Permanent on treated hair |
| New growth | Grows out softly | Needs touch-ups |
| Strength | Uses heat and smoothing formula | Strong alkaline chemicals |
| Main risk | Fumes from some formulas, dryness | Scalp burns, breakage |
| Reversible | Over time | Only by growing it out or cutting it |
Results vary with your hair and the product used.
Keratin: what to know
It suits people who are mainly fighting frizz and who want an easier blow-dry. It can also last a while, depending on the product and how you wash your hair.
The major concern is ingredients. Some products contain or release formaldehyde, and the labels aren’t always obvious. Ask for the product name, then read up on it. Good ventilation matters too.
Relaxers: what to know
Relaxers can produce a very straight look, particularly on tightly curled hair, but treated hair stays permanently changed and is more fragile. Overlapping on previously relaxed hair causes a lot of breakage, so touch-ups should target only new growth, and they should be done by someone experienced.
Scalp burns are a real risk. Tell your stylist immediately if your scalp burns during a treatment. Some research has also looked at potential health risks linked to chemical straighteners, so it’s reasonable to raise any concerns with your doctor.
Which should you choose?
- You mainly want less frizz: consider keratin, or try a good frizz routine first.
- You want permanently straight hair: a relaxer, after an honest consultation.
- You may want your curls back: avoid a relaxer. Keratin fades, while relaxed hair must grow out.
- Your hair is damaged: hold off, and speak to a stylist. Heavy chemical services can make it worse.
Also think about alternatives, such as a silk press, which is a heat-based, temporary straightening style. A curl-focused cut may also solve the problem you’re trying to fix. See our hair type chart to learn more about your texture.
What to ask your stylist
- What is the exact product, and does it contain or release formaldehyde?
- How long should I expect it to last on my hair?
- What will it do to my current color?
- What aftercare will I need, and when can I wash my hair?
- What happens if I change my mind?
Could a new cut do the job?
Sometimes a shape that works with your natural texture removes the need for a chemical service. Upload a clear photo to Hairover, get a hair analysis, and try hairstyles on your own face in Style Studio.
FAQ
Is a keratin treatment permanent?
No. Results commonly last a few months and fade with washing. A relaxer is permanent on treated hair, and only new growth needs a touch-up.
Are keratin treatments safe?
Some smoothing products contain or release formaldehyde, which is a health concern for both clients and stylists. Ask to see the exact product, and look for formaldehyde-free options. If you are pregnant, talk to your doctor first.
Can you do a keratin treatment over a relaxer?
Combining strong chemical services can seriously damage hair. Discuss your full history with a stylist, who may tell you to wait or avoid it entirely.
