Does Brazilian Blowout damage hair? Does it make hair fall out?

hairdresser applying keratin

  • The Brazilian Blowout doesn’t damage hair because it repairs the cuticles, eliminates frizz, and restores shine and manageability.
  • However, if your hair shows signs of serious damage, you shouldn’t get Brazilian Blowout. As it’s applied with heat, it could further damage your hair.
  • If you suspect that your hair is seriously damaged, I advise you to do a hair exam before the Brazilian Blowout. I’ll tell you how to do it later.


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In my salon, we do a lot of research on products before buying them, especially keratin treatments.

The Brazilian Blowout is no exception.

The treatment is sealed in the hair with the flat iron and the blow dryer at high temperatures.


  The high temperatures of the tools used are critical to know if the Brazilian Blowout can damage your hair.  

I’ll tell you a story to help you understand.


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Two months ago, a client came to the salon to ask about Brazilian Blowout.

She was tired of struggling with frizz and wanted to shorten the styling time of her curly hair.


She wasn’t looking to straighten her hair.

She just wanted to eliminate frizz and make her curls more manageable. That’s one of the results of Brazilian Blowout.

That is, you can either straighten your hair or respect the structure of the curl by hydrating or taming it.

But there was a problem.


It had been two years since this client had bleached her hair. She had done it on her own at home.

Do you know what that meant?


Her hair was seriously damaged. I noticed it as soon as I saw her hair at first glance and confirmed it when I touched it.

The texture was rough. Also, I noticed that the hair was brittle in many areas.


So, my diagnosis was clear: I couldn’t apply the Brazilian Blowout on her bleached hair. If I did, her hair would end up more damaged by the heat of the blow dryer and flat iron.

I recommended   other treatments, such as Olaplex, which aren’t applied with heat,   and repair the hair from the core.


Once her hair was restored to health, after Olaplex treatment with steps 3, 4, and 5 at home, we would re-evaluate her hair to see if it was strong enough to withstand the Brazilian Blowout.

There’s none so blind as them that will not see, and this client, who never became a client, didn’t want to see.


She left the salon very angry because she thought I was trying to sell her a more expensive treatment.

Anyway, let’s see.


A few days ago, she came back to the salon.

  She had had Brazilian Blowout applied to her severely damaged hair, and now it was ruined.  

I hate this kind of situation, especially when she could have avoided this disaster.


But there was no point in regrets.

This time, I was clear: I had to remove all the damaged parts of the hair after the Brazilian Blowout.

Do you know how many centimeters I cut?


Twenty centimeters!

I could feel her tears as my relentless scissors cut her hair.

But it was the only way to repair the mess. She’d also have to get intensive nourishment and repair treatments.


  You must analyze your hair health before applying Brazilian Blowout.   Otherwise, the results can be disastrous.

You could spot some signs of damage on your own before going to the salon. Today, I’ll show you how to do it.

First, you need to understand how Brazilian Blowout works, and that’s what I’ll talk about next.

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 How the Brazilian Blowout treatment works

takes several bleaching sessions

Brazilian Blowout is a keratin treatment that’s formulated with vitamins and nutrients from Brazil.

Keratin is a protein found in various parts of the body, such as nails and hair.


When we wash, color, and abuse heat tools, keratin decreases.

When that happens, the hair is drier, and frizz appears.


Hair has three main layers:

  • Cuticle
  • Cortex
  • Nucleus or core


The cuticles are like scales that cover your hair and protect it from different external factors.

The cortex has the pigments that color your hair and structure it. It determines whether your hair is curly, straight, or wavy.

Through the core, nutrients and proteins circulate your hair from root to tip.


Keratin accumulates in the core and expands to the cuticles.

When you color or bleach your hair, cuticles open, and some of them break and leave the cortex exposed. Then, drying begins.

What does Brazilian Blowout do?


It adds keratin to your hair and improves its health.

The salon process takes about two and a half hours.

  • Step 1: wash the hair to remove any chemicals or dirt. Separate the hair into 4 sections to apply the keratin.
  • Step 2: Brazilian Blowout is applied to each section and left in for 45 minutes. During this time, the cuticles open and the cortex of the hair absorbs the nutrients that reach the core.
  • Step 3: The hair is blow-dried at a high temperature to close the cuticles. The heat increases the flow of vitamins into the core.
  • Step 4: seal the cuticles with a flat iron at 450° F to retain the nutrients in the core.
  • Step 5: Rinse the hair with lukewarm, almost cold water so the cuticles adhere to each other.

Did anything catch your eye?


Well, you should’ve noticed that I wrote “blow-dry hair with a hairdryer at a high temperature” and “seal cuticles with a flat iron at 450°F”.

450°F equals 232°C. So, your hair is exposed to high temperatures during the process.


  If your hair is severely damaged before applying Brazilian Blowout, it won’t withstand those temperatures.  


So, how can you tell if your hair will withstand the Brazilian Blowout process?

By examining it!


How to evaluate your hair to see if Brazilian Blowout won’t damage your hair


The best advice is to visit a professional stylist to find out if your hair will withstand Brazilian Blowout. But if you don’t have the time or money, you can evaluate your hair health in a few simple steps.

Try to identify some of these characteristics:

  • Do you have frizz?
  • Is your hair coarse?
  • Is your hair dull?
  • Is your hair unmanageable and you have to tie it up all the time?
  • You can’t comb your hair when it’s wet and untangles.
  • Does your hair fall out all over the house?
  • Are your ends split and faded?

How many of these characteristics have you identified?


  • If you identified less than three of these situations, you can apply Brazilian Blowout.
  • If you identified five of these situations, go to your salon for further evaluation.
  • If you identified all of these situations, you shouldn’t apply Brazilian Blowout.


  If your hair is too damaged and you apply Brazilian Blowout, you’ll ruin it.   Later, you’ll have to cut all the damaged parts.

But you can think about other repair treatments that aren’t applied with heat, such as Olaplex or Wellaplex.

They’ll repair your hair so that you can apply Brazilian Blowout when it’s healthier.



If your hair is severely damaged, you shouldn’t apply Brazilian Blowout. It won’t withstand the heat applied during the process, and your hair will burn.

If your hair has mild to moderate damage, Brazilian Blowout will have a repairing effect on it.

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