A keratin treatment is a salon smoothing service that coats the hair to reduce frizz and make it easier to style. It is not permanent: results last a few months, and different types vary in how straight the hair looks, how long they last and how they are applied.
If you are curious about keratin treatments, the choices can be confusing. This guide compares the main types so you can talk to your stylist and pick the right one.
What does a keratin treatment actually do?
A keratin treatment applies a smoothing formula to the hair, which is then sealed in with a flat iron. It reduces frizz, adds shine and makes hair easier to straighten, but it does not turn curly hair permanently straight. The effect fades with washing. For a stronger straightening result, see rebonding.
Keratin treatment types at a glance
| Type | What it is | How straight it looks | Typical lasts | Best for |
|---|---|---|---|---|
| Classic Brazilian keratin | Traditional smoothing formula | Very smooth, can be quite straight | 3 to 5 months | Frizzy, wavy hair |
| Brazilian blowout style | Branded smoothing service | Smooth, shiny | 8 to 12 weeks | Frizz control |
| Formaldehyde-free keratin | Smoothing formula marketed without formaldehyde | Smooth, less straight | 2 to 4 months | Those who prefer ingredient-conscious options |
| Express or soft keratin | Quick, lighter smoothing | Softer, reduces frizz | 4 to 8 weeks | Short on time, fine hair |
| Cysteine treatment | Amino-acid based smoothing | Natural, soft smoothing | 2 to 4 months | Colour-treated hair |
| Nanoplastia or hair botox | Conditioning-style treatments | Smooth but not very straight | 1 to 3 months | Dry, frizzy or damaged-looking hair |
| At-home keratin kits | DIY smoothing kits | Mild smoothing | A few weeks | Light frizz |
Durations and results vary by brand, hair type and aftercare. Ask your stylist what to expect.
Brazilian keratin treatment
This is the best known type. It gives a smooth, glossy finish and can last several months. It is popular for frizzy or wavy hair. Many salons have their own branded version, so ask which one they use.
Formaldehyde-free options
Some brands market their smoothing treatments as formaldehyde-free. Labelling differs between products, so ask your stylist for the ingredient list and product information. Whichever you choose, make sure the salon is well ventilated and follows the manufacturer's instructions.
Express and soft keratin treatments
Express treatments are quicker and give a softer result, with less straightening and a shorter lifespan. They suit people who want less frizz without a big change.
Cysteine treatments
Cysteine-based treatments are marketed as gentler smoothing, often for hair that has been coloured. The results are softer and more natural.
Nanoplastia and hair botox: are they keratin?
They are different. These are conditioning-style treatments that coat the hair to make it look smoother and healthier. They are often confused with keratin, but the finish is usually more subtle.
At-home keratin kits
Home kits offer mild smoothing for a lower price. Results tend to be lighter and shorter-lived than salon treatments, so follow the instructions closely and do a strand test.
Which treatment is best for your hair type?
- Frizzy or wavy hair: classic Brazilian keratin or a branded blowout.
- Fine hair: an express or soft treatment, which is less heavy.
- Coloured hair: ask about a cysteine treatment and tell your stylist about any recent colour. See dye timing and results.
- Very curly or coily hair: ask for a consultation, as results vary.
How long do keratin treatments last and what do they cost?
Most last about two to five months, and they can last longer if you use sulfate-free shampoo and limit washing. Prices vary widely by salon, city and hair length, so request a quote that includes the treatment and any aftercare products.
Aftercare tips
- Follow your stylist's advice on when to wash your hair, often a few days
- Use sulfate-free shampoo and conditioner
- Avoid chlorine and salt water where possible
- Use a gentle brush and avoid tight styles for the first days
- Use low heat when styling. See how to dry hair without a blow dryer
Keratin vs rebonding vs relaxer
| Keratin | Rebonding | Relaxer | |
|---|---|---|---|
| Effect | Smooths and reduces frizz | Makes hair very straight | Straightens tight curls |
| Lasts | A few months | Until hair grows out | Until hair grows out |
| Best for | Frizz control | Very straight look | Tight curls |
Frequently Asked Questions
What are the types of keratin treatments?
Classic Brazilian, formaldehyde-free, express or soft, cysteine and conditioning-style treatments such as nanoplastia, plus at-home kits.
How long does a keratin treatment last?
Usually two to five months, depending on the type and your aftercare.
Is keratin the same as hair botox?
No. Hair botox and nanoplastia are conditioning-style treatments with a more subtle effect.
Can you get keratin on coloured hair?
Often yes, but tell your stylist about recent colour so they can choose the right formula.
Does keratin make hair straight?
It smooths frizz and makes hair easier to straighten, but it does not turn curly hair permanently straight.
