Side by side
| Brazilian Blowout | Keratin treatment | |
|---|---|---|
| Lasts | 10 - 12 weeks | 3 - 5 months |
| Appointment | 90 min - 2.5 hrs | 2.5 - 4 hrs |
| Wash wait | Often shorter | Commonly 48 - 72 hrs |
| Volume retained | More | Less |
| Smoothing effect | Moderate | Stronger |
| Curl retained | More | Less |
| Cost | $200 - 400 | $150 - 400 |
Typical US pricing. Protocols vary by product — confirm with the salon.
Read the volume and curl rows together, because they are the same fact stated twice. One does more to your texture; the other leaves more of it alone. Everything else follows from that.
Which to choose
| You want | Choose |
|---|---|
| To keep your curl pattern with less frizz | Brazilian Blowout |
| To wash sooner afterwards | Brazilian Blowout |
| A shorter appointment | Brazilian Blowout |
| Maximum smoothing | Keratin |
| The longest-lasting result | Keratin |
| The best cost per month | Keratin, because it lasts longer |
Cost per month of wear
Per-appointment prices overlap almost completely. Duration is what separates them financially.
| Treatment | Price | Lasts | Per month |
|---|---|---|---|
| Brazilian Blowout | $300 | 3 months | Around $100 |
| Keratin treatment | $300 | 4.5 months | Around $67 |
| Brazilian Blowout | $250 | 2.5 months | Around $100 |
| Keratin treatment | $400 | 5 months | $80 |
Illustrative arithmetic at typical prices, not quotes.
Keratin generally wins on cost per month. Brazilian Blowout wins on convenience and volume retention. Whether convenience is worth roughly thirty dollars a month is a personal question and not one a comparison table can settle.
The practical differences that decide it
Most people choose on logistics rather than chemistry, and that is a reasonable way to choose.
| Consideration | What it favours |
|---|---|
| You cannot spare a four-hour appointment | Brazilian Blowout |
| You work out most days and need to wash your hair | Brazilian Blowout, but confirm the protocol |
| You have fine hair and do not want it flattened | Brazilian Blowout |
| Your frizz is severe and humidity is the enemy | Keratin |
| You would rather do this twice a year than four times | Keratin |
| Curly hair you want to keep curly | Brazilian Blowout |
Safety considerations apply to both
Both categories include products that contain formaldehyde or release it when heated. The considerations are identical for either, and choosing one over the other is not a way of avoiding the question.
Ask which specific product is being used, ask to see its safety data sheet, and ask how the space is ventilated. If you are pregnant, breastfeeding, or have a respiratory condition, speak to your doctor before booking either.
Switching between them
You can move between the two, and plenty of people do after finding one too much or too little.
- Wait until the current treatment has largely faded before applying the other, unless your stylist says otherwise.
- Tell the stylist exactly what you had last time, including the product name if you know it.
- Expect the first result after switching to feel different even on the same hair — the starting point is not the same.
- Do not stack them to get a stronger result. More heat processing on the same hair is how damage starts.
If you have tried one and wanted more smoothing, the answer is usually the other category rather than a second appointment of the same thing sooner. Frequency is the variable that hurts hair, and it is the one most easily avoided.
What is identical between them
The differences get all the attention, but the parts that decide whether you are happy afterwards are the same for both.
| Shared | Detail |
|---|---|
| Sulphate-free products | Required for either, or you lose weeks of wear |
| The flat-iron step | High heat over the whole head in both cases |
| Fading rather than growing out | Neither leaves a regrowth line |
| Not straightening | Both smooth and loosen curl; neither makes hair poker-straight |
| Ingredient questions | Ask about the specific product in either category |
| Colour sequencing | Let your stylist decide the order, either way |
Choosing between them does not change any of that. If a salon implies one category exempts you from sulphate-free products or from asking what is in the bottle, that is a reason to ask more questions rather than fewer.
Frequently asked questions
Q.Which lasts longer?
Keratin treatments, typically by several weeks — three to five months against 10 to 12 weeks.
Q.Which is faster?
Brazilian Blowout usually, at 90 minutes to 2.5 hours versus 2.5 to 4 hours.
Q.Which keeps more volume?
Brazilian Blowout. Retaining volume and curl is a large part of its appeal.
Q.Which is cheaper?
Similar per service. Keratin is usually cheaper per month of wear because it lasts longer.
Q.Are both safe?
Both categories include products with the same ingredient considerations. Ask about the specific product, its safety data sheet and ventilation, whichever you choose.
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