Hair guide · Smoothing vs straightening
Keratin vs Hair Smoothening vs Straightening: What’s the Difference?
Keratin, smoothening, rebonding, Japanese straightening, permanent blow dry – the names overlap and the results do not. Here is what each term usually means, how long it lasts and what happens as your hair grows.
Quick answer
Keratin vs smoothening is mostly a question of names. “Smoothening” is a loose salon term that can mean a semi-permanent smoothing treatment or a permanent chemical straightening service. Keratin (up to 6 months) and Brazilian Blowout (up to 12 weeks) are semi-permanent: they tame frizz and fade gradually. Rebonding, Japanese straightening and relaxers are permanent: treated hair stays straight until it grows out. We offer keratin, Brazilian Blowout and protein – not permanent straightening.
Ask three salons for “smoothening” and you may get three different treatments. One means a keratin treatment, another means rebonding, and a third uses the word for anything that makes hair less frizzy. The result is a lot of confusion – and the risk of booking a permanent change when you only wanted softer, easier hair for a few months.
This guide explains the general terms, how each method is typically described and how to choose. We focus on semi-permanent smoothing, and we will tell you honestly when something is a service we do not offer.
Keratin vs smoothening: what do the words actually mean?
Most confusion about the hair smoothing and keratin difference comes from the fact that keratin is one type of smoothing, while “smoothening” on a salon menu can mean several things.
Hair smoothening
“Smoothening” (or smoothing) describes a goal more than a method: less frizz, softer texture and hair that dries sleek. In everyday use it often refers to a chemical smoothing or straightening service, but the exact treatment depends on the salon. That is why the most useful question to ask before booking is simple: which method is this, and is it permanent or semi-permanent?
Permanent hair straightening: rebonding, Japanese straightening and relaxers
Rebonding and Japanese straightening are usually described as permanent chemical straightening. They change the structure of the treated hair, so those lengths stay straight until they grow out or are cut. Relaxers are another permanent chemical straightening method. The trade-off is regrowth: new hair comes in with its natural texture, so the roots need retouching to match.
Semi-permanent smoothing: keratin and Brazilian Blowout
A Brazilian keratin treatment and the Brazilian Blowout are semi-permanent smoothing treatments. They are sealed with heat to smooth the cuticle, tame frizz and add shine, then wash out gradually over the following weeks and months. Your natural texture returns as they fade, and you can repeat them whenever you like. This is the kind of smoothing we specialise in, together with our protein hair treatment.
The key difference
Hair smoothening and straightening difference
The clearest way to see the difference between hair straightening and smoothening is to ask what happens over time.
- Semi-permanent smoothing (keratin, Brazilian Blowout) works on the surface of the hair. Frizz is tamed for weeks or months, then the result softens with every wash.
- Permanent straightening (rebonding, Japanese straightening, relaxers) changes the treated hair itself. It does not wash out – it has to grow out.
- Smoothing gives you flexibility: you can change your mind, colour, or let your natural texture return. Permanent straightening is a longer commitment.
Side by side
Keratin vs smoothening vs rebonding compared
How the main methods are typically described. Rebonding and Japanese straightening are shown for comparison only – we do not offer them.
| Keratin treatment | Brazilian Blowout | Rebonding / Japanese straightening | |
|---|---|---|---|
| Type | Semi-permanent smoothing | Semi-permanent smoothing | Permanent chemical straightening |
| Result | Sleek, straighter, frizz-free hair | Smooth, glossy hair with natural movement | Very straight hair in the treated lengths |
| How long it lasts | Up to 6 months, fading gradually | Up to 12 weeks, fading gradually | Until the treated hair grows out or is cut |
| Regrowth | Roots grow in natural; result blends as it fades | Roots grow in natural; result blends as it fades | Roots grow in natural and are usually retouched |
| Effect on curls | Curls relax or straighten | Softens and defines curls; wear curly or straight | Curls are straightened in the treated hair |
| Washing afterwards | Usually after 48 – 72 hours, as your specialist advises | The same day | As advised by the salon that performs it |
| Upkeep | Sulfate-free care; repeat when it fades | Brazilian Blowout aftercare; results build up over time | Root retouches as hair grows |
| Price with us | AED 420 – AED 895 | from AED 685 – AED 1,550 | Not offered |
| Treatment | Short hairAbove the shoulders | Medium hairShoulder length | Long hairBelow the shoulder blades | Very long hairWaist length and longer | Book Now |
|---|---|---|---|---|---|
| Brazilian Hair Keratin Treatment2 – 4 hours | AED 420 | AED 575 | AED 740 | AED 895 | Book Now |
| Brazilian BlowoutFrom 80 minutes | from AED 685 | from AED 840 | from AED 1,200 | from AED 1,550 | Book Now |
| Protein Hair Treatment2 – 3 hours | from AED 475 | from AED 630 | from AED 840 | from AED 950 | Book Now |
All prices include VAT
Is hair smoothening permanent?
It depends entirely on the method. If “smoothening” means keratin or Brazilian Blowout, the answer is no – both are semi-permanent. A keratin treatment lasts up to 6 months (usually 3 – 6) and a Brazilian Blowout up to 12 weeks, and both fade gradually as you wash your hair. If “smoothening” means rebonding, Japanese straightening or a relaxer, the treated hair is permanently straightened, and only new growth comes in with your natural texture.
What happens as your hair grows
With semi-permanent smoothing, your roots grow in natural while the treatment softens at the same time, so there is no hard line to manage – you book again when the frizz returns. With permanent straightening, the straight lengths do not soften, so the contrast with natural roots grows and the roots are usually retouched.
What happens to your curls
For keratin, curls relax or straighten and frizz disappears – often the most dramatic change of the two semi-permanent options. A Brazilian Blowout softens and defines curls while keeping body, so you can wear them natural or blow them out smooth. Permanent straightening is generally chosen when someone wants their curls gone for good in the treated hair.
Permanent blow dry vs smoothening
“Permanent blow dry” is a popular nickname for the Brazilian Blowout – but it is not permanent. It smooths frizz and adds shine while keeping natural volume, takes as little as 80 minutes, lasts up to 12 weeks and lets you wash, exercise or tie your hair up the same day. So a “permanent blow dry” is semi-permanent smoothing, not straightening.
Keratin smoothing treatment: side effects and safety
What about hair smoothening side effects? For keratin and Brazilian Blowout, some people notice eye, nose or throat irritation from vapour during the flat-iron stage, and the scalp can become irritated if product touches the skin. Hair can feel a little flatter at first, and very damaged or heavily bleached hair may need repair before any smoothing. What matters most is how it is applied: a trained specialist, good ventilation and keeping product off the scalp. We also recommend waiting during pregnancy and breastfeeding. Read our full guide: is keratin treatment safe?
For permanent straightening, ask the salon that offers it whether it suits your hair, especially if it is coloured or damaged – the change cannot be washed out.
Make your choice
Which is better, keratin or smoothening? How to choose
Start with one question: do you want less frizz and easier styling for a few months, or a permanent change to your texture?
Choose keratin if…
- Frizz and humidity are your biggest problems
- You want hair that dries sleek and straighter, with a quick blow-dry
- You want the longest-lasting smoothing – up to 6 months
- You can wait usually 48 – 72 hours before washing
Choose Brazilian Blowout if…
- You want smooth, glossy hair that keeps its movement
- You like to wear your hair curly or straight
- You need no downtime – wash the same day
- Results of up to 12 weeks fit your routine
If your hair feels weak, dry or over-processed, a protein hair treatment smooths while focusing on strength, and lasts 3 – 5 months. And if you have decided you want permanent straightening, that is a different service to the ones we offer – our page on hair straightening treatments explains the semi-permanent options so you can compare before you decide.
Upkeep
Keeping smoothed hair smooth
Semi-permanent smoothing lasts longest when you look after it. For keratin, keep your hair dry and loose until your specialist says you can wash – usually 48 – 72 hours – then wash 2 – 3 times a week with a sulfate-free shampoo.
For a Brazilian Blowout, there is no waiting period, and Brazilian Blowout aftercare helps the result last up to 12 weeks. Want to colour? For both treatments, colour before your appointment or wait about two weeks after it.
Our keratin aftercare guide covers the first week step by step.
In short
Key takeaways
- “Smoothening” is a loose term – always ask which method and whether it is permanent.
- Keratin: semi-permanent, up to 6 months, AED 420 – 895, fades gradually.
- Brazilian Blowout: semi-permanent, up to 12 weeks, from AED 685, wash the same day.
- Rebonding, Japanese straightening, relaxers: permanent on treated hair; regrowth needs retouching.
- We offer keratin, Brazilian Blowout and protein – not rebonding, relaxers or Japanese straightening.
Ready when you are
Find the right smoothing for your hair
Every appointment starts with a consultation, or send us a photo of your hair on WhatsApp first. Bookings are in Dubai, and a specialist can also come to you. Read more about our keratin treatment and the Brazilian Blowout, or book online in a minute.
Frequently asked questions
What is the difference between keratin and hair smoothening?
“Hair smoothening” is a general salon term, not one specific treatment. Some salons use it for a semi-permanent smoothing treatment like keratin, others for a permanent chemical straightening service. Keratin is semi-permanent and fades gradually over up to 6 months. Always ask which method a “smoothening” service uses and whether it is permanent.
What is the difference between hair smoothening and straightening?
Smoothing usually means taming frizz and softening texture with a semi-permanent treatment such as keratin or Brazilian Blowout, which washes out gradually. Permanent straightening, such as rebonding, Japanese straightening or a relaxer, changes the hair structure so treated hair stays straight until it grows out or is cut.
Is hair smoothening permanent?
It depends on the method. Keratin and Brazilian Blowout are semi-permanent: keratin lasts up to 6 months and Brazilian Blowout up to 12 weeks, and both fade gradually. Rebonding, Japanese straightening and relaxers are permanent on the treated hair, while new growth comes in with your natural texture.
Which is better, keratin or smoothening?
If by smoothening you mean permanent straightening, keratin is the gentler commitment: it fades gradually, your natural texture returns and you can repeat it whenever you like. Permanent straightening does not wash out, but regrowth needs retouching. If you mainly want less frizz and faster blow-drying, keratin or Brazilian Blowout is usually enough.
What is the difference between keratin and rebonding?
Keratin is a semi-permanent smoothing treatment that lasts up to 6 months and fades gradually. Rebonding is a permanent chemical straightening service: treated hair stays straight until it grows out, and the new growth is usually retouched at the roots. We offer keratin, Brazilian Blowout and protein, but not rebonding.
What are the side effects of hair smoothening?
With keratin or Brazilian Blowout, some people notice eye, nose or throat irritation from vapour during the flat-iron stage, and the scalp can become irritated if product touches it. Very damaged hair may need repair first. Trained application, good ventilation and keeping product off the scalp matter most. We recommend waiting during pregnancy and breastfeeding.
Is a permanent blow dry the same as smoothening?
“Permanent blow dry” is a popular name for the Brazilian Blowout, but it is not permanent. It smooths frizz and adds shine while keeping natural movement, lasts up to 12 weeks and lets you wash your hair the same day. It is a semi-permanent smoothing treatment, not permanent straightening.
Do you offer rebonding or Japanese straightening?
No. We do not offer rebonding, Japanese straightening or relaxers. We specialise in semi-permanent smoothing: keratin (up to 6 months, AED 420 – 895), Brazilian Blowout (up to 12 weeks, from AED 685) and protein treatment (3 – 5 months, from AED 475). Send us a photo of your hair on WhatsApp and we will suggest the closest option.
Ready for smooth, glossy hair?
Book in a minute online or send us a WhatsApp – our hair specialists will confirm your time.