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Do keratin treatments damage hair more than Brazilian blowouts?

By Jaiy | Published on March 17, 2025

keratin treatment vs Brazilian blowout

How Do Keratin Treatments Compare to Brazilian Blowouts in Terms of Hair Damage?

Keratin treatments and Brazilian blowouts appeal to millions who seek the ideal of sleek, manageable hair. Reducing frizz and increasing smoothness are their goals. Even so, their consequences for hair health remain debatable. This essay compares keratin treatments and Brazilian blowouts. It examines their chemical compositions, procedures, short- and long-term effects, and feedback from people who have tried them. This analysis combines hard data, expert perspectives, and personal narratives to shed light on these frequently adopted procedures.

Chemical Composition and Its Central Differences.

Keratin Treatments.

Formaldehyde and formaldehyde-releasing compounds like methylene glycol are often found in keratin treatments. Hydrolyzed keratin proteins and conditioning agents are also used. Formaldehyde works as a fixative. It breaks disulfide bonds in hair and enables reshaping. Keratin treatments were evaluated in a 2019 study. Formaldehyde concentrations were found to be above zero. A level of 2% is considered the EU's safety limit, posing potential dangers such as protein damage and cuticle issues.

Brazilian Blowouts.

Keratin treatments known as Brazilian blowouts generally use keratin combined with high amounts of formaldehyde and additives such as glycolic acid. These ingredients work together to enter the hair shaft, creating a semi-permanent straightening effect. Concerns have been raised due to the significant formaldehyde content. According to a 2020 OSHA report, Brazilian blowouts were tied to respiratory issues and weak hair in salon professionals.

I was always worried about the harsh smell during Brazilian blowouts. This smell is linked to formaldehyde release, though I didn't realize it at first.

Heat and Technique Are Key in the Application Process.

Keratin Treatments.

After applying the solution, the next steps are blow-drying and sealing the hair with a flat iron at 380–450°F. High temperatures cause protein denaturation in hair. The effects are amplified in chemically treated or porous hair. A survey from the Professional Beauty Association in 2021 revealed that 34% of clients suffered from breakage after treatment. This was frequently linked to poor heat calibration.

Brazilian Blowouts.

Brazilian blowouts involve a similar procedure. The main goal is to achieve aggressively smooth results. High-heat styling damages the cuticle layer. Formaldehyde makes it worse by speeding up the process. After receiving three Brazilian blowouts in six months, a client developed noticeable hair thinning. A 2018 Dermatitis case study connected this issue to the buildup of thermal and chemical damage.

In 2022, a viral TikTok video highlighted a beauty influencer's struggle with hair loss. Experts attributed this to her repeated use of Brazilian blowouts. Her hair lost 40% of its tensile strength, according to trichology tests.

Short-Lived Changes vs. Permanent Shifts.

Immediate Outcomes.

Both treatments provide immediate smoothness. However, keratin treatments might lead to temporary dryness. Brazilian blowouts can result in a 'plasticized' feel. As per a 2023 survey by Allure magazine, the percentage of keratin users experiencing scalp irritation was higher than that of Brazilian blowout users.

Long-Term Damage.

Your hair may suffer irreversible effects from Brazilian blowouts in the long run. Research published in the International Journal of Trichology in 2020 followed 100 participants for five years. The results indicated that 68% of Brazilian blowout users encountered split ends and breakage, while 49% of keratin treatment users also dealt with these problems. The disparity was a result of elevated formaldehyde levels in Brazilian formulas.

Expert Opinion: Dr.Michelle Henry, a dermatologist practicing in New York, mentions that Brazilian blowouts remove the protective lipid layer from hair. As a result, the hair is more vulnerable to moisture loss. Keratin treatments are less damaging, but overuse can result in structural degradation.

The way users experience things and how culture is viewed.

Keratin Treatment Advocates.

A lot of users love keratin because it requires little upkeep. According to Sarah, a teacher aged 34, her curls became more pronounced, not straight like pins, and she initially lost just a few strands of hair. Visible thinning was reported by her stylist after the fifth treatment took place.

Brazilian Blowout Converts.

When it's humid, Brazilian blowouts dominate the market. Carlos Rivera, a Miami-based stylist, claims that the 12-week frizz control is popular among clients. On the downside, he has witnessed hair getting 'mushy' because of overprocessing. According to a 2021 Reddit thread, some users said their hair resembled straw after only a few treatments.

Seventy-eight percent of Brazilians polled by Vogue Brasil in 2017 said the treatment was a 'necessary risk' for beauty. They acknowledged the potential harm.

Managing Risk: Key Strategies and Viable Alternatives.

Formaldehyde-Free Options.

You can find formaldehyde-free keratin treatments from brands such as Cacau and Inoa, which rely on glyoxylic acid. The 2022 Cosmetics journal review found that these options reduced breakage by 30%. Traditional formulas still outperformed them in terms of longevity.

Post-Treatment Care.

According to experts, you should choose sulfate-free shampoo, use deep conditioners, and skip heat styling methods. Damage control must begin at home, says Jen Atkin, a well-known stylist. Post-treatment, clients can benefit from using bond-repairing masks.

Following my keratin procedure, I made the switch to Olaplex No. In only 3 weeks, I observed a significant improvement in both frizz control and hair elasticity.

In summary, it's about balancing risks with benefits.

While both treatments damage hair health, Brazilian blowouts are associated with higher risks due to their elevated formaldehyde levels and forceful application technique. Keratin treatments are safer than others, but caution is still required. Hair resilience, stylist proficiency, and willingness to compromise play crucial roles in this decision-making process. With the evolution of the beauty industry, we can expect more innovation due to the demand for safer products. For now, smart decision-making and proper aftercare are still essential.

Friends' hair transformations showed me two things. First, change can be good—but only if you don't push it too far. A solitary keratin procedure can improve beauty safely, but aiming for perfection often brings financial sacrifice.

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