Advice
Shampoo for Brazilian Blowouts: How to Choose One and Make the Results Last Longer
Sulfates, salt, hot water: what to look for when choosing a shampoo after a Brazilian blowout—and tips to make the results last longer.
You leave the salon with smooth, supple, and shiny hair, and just one question on your mind: how can you make this look last as long as possible? The Brazilian straightening treatment infuses the hair shaft with a conditioning agent that develops over the weeks. And it’s precisely when you wash your hair that everything comes into play. A shampoo that’s too harsh, water that’s too hot, or an exfoliating scrub can cause the straightening treatment to wear off much sooner than expected. On the other hand, a gentle shampoo and a routine tailored to your hair length will keep your hair soft and shiny month after month. Here’s how to choose the right shampoo after a Brazilian straightening treatment—and what daily habits to adopt to maintain the results.
Why is shampoo so important after a hair straightening treatment?
This professional technique is performed at a hair salon: the stylist applies a treatment—often keratin-based—and then seals it in with a flat iron. The cuticle scales of the hair shaft close, frizz disappears, and the hair becomes manageable and shiny. This result is not permanent. It gradually fades, and the main factor that causes it to fade is shampooing.
Every shampoo acts on the surface of the hair. A powerful cleanser opens the cuticles and washes away some of the conditioning product that has been applied. A gentle cleanser, on the other hand, cleanses the roots without stripping the lengths. That’s why choosing the right shampoo is just as important as the straightening treatment itself: it’s what determines, week after week, how long your results will last.
Straightened hair is also damaged hair. The use of a flat iron—and sometimes previous coloring or bleaching—has weakened its structure. It needs moisture and flexibility to stay healthy and beautiful, not just to be washed.
How long should I wait before washing my hair for the first time?
After the treatment, your hair needs time to set. The timeframe most commonly recommended by stylists is between 48 and 72 hours, but it depends on the technique and product used: always follow your stylist’s specific instructions. During this post-straightening period, it’s best to keep your hair dry and loose:
- no shampoo, no rain, no prolonged exposure to shower steam;
- no elastic, clips, or barrettes that would mark the length;
- Don't tuck your hair behind your ears, so as not to create a crease.
If your roots get oily during these first few days, be patient: washing your hair too soon is the most common mistake—and the one that will cost you the most in terms of how long your straightening treatment lasts.
What shampoo should you use after a Brazilian straightening treatment?
To choose the right shampoo after a straightening treatment, reading the label is more important than marketing claims. Three criteria make all the difference when making a purchase.
A sulfate-free shampoo
Sulfates (sodium lauryl sulfate, sodium laureth sulfate) are surfactants that produce a lot of lather and have strong degreasing properties. On straightened hair, they open the cuticles and accelerate the loss of the straightening treatment. Sulfate-free shampoos rely on gentler surfactants that cleanse without causing damage. If you want to understand in detail why you should avoid sulfates, this is the first rule of any straightening regimen.
A shampoo without sodium chloride
Sodium chloride—in other words, salt—is often used as a thickening agent in cleansing products. It is known to speed up the rinsing process. Look for “Sodium Chloride” in the INCI list: for straightened hair, it’s best to choose a product that doesn’t contain it. Be careful, though—other ingredients include the word “sodium” without actually being sodium, such as Sodium Hyaluronate, a form of hyaluronic acid: you should specifically look for “Sodium Chloride.”
A gentle, moisturizing formula
The ideal gentle shampoo for straightened hair moisturizes while cleansing. Look for active ingredients that coat and soften the hair, such as plant-based keratin or hyaluronic acid, and avoid heavy formulas that dull the shine. Our guide to sulfate-free keratin shampoos goes into detail about these active ingredients.
In summary, here are the ingredients to avoid before purchasing your product:
- Sulfates: SLS, SLES, Ammonium Lauryl Sulfate;
- Salt-based thickener: Sodium Chloride;
- Clarifying or exfoliating cleansers: detox shampoos and grain-based scrubs—save these for later.
Price isn't the right indicator: a good product, regardless of the brand, is judged by its ingredients and quality. A concentrated skincare product, when used in small amounts, can actually be more economical in the long run.
How can you wash your hair without compromising the results of your straightening treatment?
The right product isn't enough—the recommended technique is just as important. Here's the routine to follow so that every time you shower, your hair comes out smooth and retains its style.
- Wet thoroughly with lukewarm water. Hot water opens the scales and weakens the product; lukewarm water cleans just as well.
- Focus the shampoo on the roots. Massage with your fingertips, without rubbing the lengths. The lather that runs down as you rinse is enough to clean them.
- Rinse very thoroughly. Product residue weighs down the hair and dulls its shine.
- Apply a mask to the lengths of your hair. On towel-dried hair, apply from the mid-lengths to the ends, then rinse.
- Dry gently. Pat dry with a cotton or microfiber towel—without rubbing—then detangle with a wide-tooth comb.
When it comes to frequency, the trick is to space out your washes as much as your roots will allow. Fewer shampoos mean less stress on the hair shaft. But an oily or uncomfortable scalp isn’t an option: if you need to wash your hair often, choose a shampoo that’s gentle enough for frequent use. To refine your technique, our guide to the perfect shampoo walkthrough covers every step.
How can you maintain and prolong the results of your hair straightening treatment on a daily basis?
Between washes, just a few simple habits are all it takes to maintain the straightening effect and keep your hair soft, shiny, and manageable.
Feed the fiber every week
A nourishing hair mask after every shampoo restores the suppleness to the lengths that straightening irons may have stripped away. For dry or very damaged hair, a longer-acting hair treatment once a week makes all the difference. A lightweight oil rounds out the routine: choose a dry oil that doesn’t leave a greasy residue, rather than argan oil applied in excess, which would weigh down your hair.
Protecting Heating Devices
Straightening reduces the need for blow-drying, but sometimes you’ll still need to use a hair dryer or flat iron. Before using your heated styling tools, set them to a moderate temperature and always apply a heat protectant. Our article on protecting your hair from heat explains how to keep your hair healthy.
Limit exposure to the ocean, chlorine, and the sun
The ocean, pool chlorine, and prolonged sun exposure are the biggest enemies of straightened hair. Before swimming, dampen your hair and apply a protective treatment; afterward, rinse it out immediately. For this reason, set aside scrubs and exfoliating shampoos for the entire duration of your straightening treatment: this includes our Scrub, formulated with fleur de sel, which we do not recommend using while the treatment is active.
Preserving Length at Night
Sleep with your hair down, ideally on a satin or silk pillowcase, which reduces friction and frizz. Avoid tight hair ties: to tie your hair back, opt for a wide clip or a fabric scrunchie.
These tips apply to all techniques, whether it's a keratin treatment, an Indian straightening treatment, or a straightening treatment on curly hair: protecting the hair shaft is still the best way to make the results last longer, for both women and men.
What hair care products should you choose after a straightening treatment?
At Madame d'Alexis, our hair care products are made in France and formulated without added water, using organic hydrosols of Damask rose, chamomile, and orange blossom, combined with active ingredients derived from skincare. Formulas free of silicones and parabens, and a sulfate-free shampoo: a hair care line designed for sensitized hair. Discovering these products means enjoying nourished strands without weighing down your hair.
Le Shampoing is our sulfate-free shampoo, made with 98% naturally derived ingredients. Its organic hydrosols moisturize, soothe, and add shine to the hair, while cationic hyaluronic acid, prebiotics, and plant-based keratin coat the hair strands. Its ingredient list, available on the product page, does not contain sodium chloride. Use it as a double shampoo on thoroughly wet hair: massage in, rinse, repeat, then rinse very thoroughly. Its gentle formula makes it suitable for daily use.
The Mask, which is 97% naturally derived, repairs, nourishes, and softens the hair lengths thanks to plant-based ceramides, cationic hyaluronic acid, orange blossom wax, and organic apricot and jojoba oils. Directions for use: Leave it on for 5 to 10 minutes on towel-dried hair, or 20 to 30 minutes for a deep treatment, and always rinse thoroughly to restore suppleness to the lengths. For sensitized hair, a weekly overnight treatment provides intense nourishment.
The Day Serum, a 99% naturally derived dry oil, protects your hair lengths before blow-drying. It combines organic jojoba oil, plant-based ceramides, antioxidants, and natural heat protectants effective up to 200 °C. Just one to three drops on the lengths and ends—applied to dry or slightly damp hair—are enough to restore shine without leaving a greasy residue.
The Pink Wide-Tooth Detangling Comb, made of cellulose acetate, detangles wet hair without pulling thanks to its wide teeth.
If your hair is very dry after straightening, be sure to check out our selection of products for dry hair.
The Shampoo
The Mask
The Day Serum
Moisturizing Routine
The Pink Wide-Tooth Detangling Comb
Does your hair straightening treatment deserve a customized routine?
We'll ask you a few questions about your scalp and hair, and then we'll create a personalized routine for you using our five organic hydrosol treatments, formulated without added water.
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FAQ: Your Questions About Maintaining Straightened Hair
Can you use regular shampoo after getting a hair straightening treatment?
This is not recommended. Conventional products often contain sulfates and sometimes salt, two ingredients known to shorten the duration of the results. A sulfate-free shampoo without sodium chloride is the safest choice for maintaining the results.
How many times a week should you wash your hair after getting it straightened?
There's no one-size-fits-all rule: it all depends on your hair type. The key is to space out washes as much as possible without causing discomfort to your scalp. With a gentle product, frequent washing won't affect your hair's hold.
Is a keratin shampoo helpful after a hair-straightening treatment?
It can be: plant-based keratin coats the hair shaft and helps keep it soft. But it doesn't replace the most important factor—the absence of sulfates and sodium chloride. A keratin treatment that contains sulfates would still be too harsh for straightened hair.
Can you dye your hair after getting it straightened?
It's possible, but the order and timing of the two treatments depend on the products used. Ask your hairstylist—an expert on your hair who knows the formula used and the condition of your hair—for advice.
How can I tell if my shampoo contains salt?
Read the INCI list on the back of the bottle: it appears there under the name Sodium Chloride. If you don't see this listed, your product does not contain it. To learn more, our free hair assessment will help you find the right products for your hair.
The right shampoo: the first step to long-lasting straight hair
Successful hair straightening lasts longer when you care for your hair at home. The best shampoo to use after a straightening treatment is gentle, sulfate-free, and sodium chloride-free; it should be paired with a nourishing mask, heat protection, and a few simple steps to protect your hair from the ocean, chlorine, and the sun. With this routine, your hair will retain its softness, shine, and that smooth texture you loved so much when you left the salon for much longer.
