Generally, yes. The treatments are highly compatible with procedures such as coloring, bleaching, keratin treatments, relaxers, and straightening services performed previously.

However, the safety of the application depends primarily on the current condition of the hair fiber.

Before the procedure, it is essential to assess the hair's strength, elasticity, porosity, chemical history, and level of sensitization.

No. The result can be customized based on the protocol used.

Lower temperatures and fewer passes tend to preserve the natural curl pattern while reducing frizz and controlling volume, resulting in alignment, shine, and definition.

Increasing the temperature and the intensity of the thermal sealing process allows for a more intense and long-lasting straightening effect.

Straightening procedures should not be performed on severely weakened hair.

In such cases, we recommend first carrying out hair fiber recovery protocols and only proceeding with the straightening once the hair shows adequate strength for the procedure.

Yes, provided the hair is in a suitable structural condition to undergo a new treatment.

A hair analysis and a strand test are essential, especially for hair that has undergone multiple chemical processes.

We do not recommend performing straightening treatments on severely compromised hair.

When there is a significant loss of strength, elasticity, or structural integrity, it is best to prioritize recovery, hydration, lipid replenishment, and reconstruction protocols before undergoing a new chemical treatment.

Sarah K does not recommend chemical treatments for pregnant or breastfeeding women without the express authorization of their attending physician.

For safety reasons, any chemical procedure during pregnancy or breastfeeding should be discussed beforehand with the responsible healthcare professional.

A slight change in shade may occur, particularly with very light blonde, bleached, or highly porous hair.

This change is primarily linked to heat exposure during the thermal sealing process and the condition of the hair fiber.

To minimize the risk, it is important to perform a hair analysis, use the appropriate temperature, adjust the number of passes, and conduct a strand test.

No. Sarah K protocols can be performed using high-quality professional flat irons available on the market.

More important than slight differences in the temperature indicated by the equipment is using a flat iron that maintains uniform heating and good thermal stability throughout the entire procedure.

Some product lines feature cosmetic pigments designed to help neutralize unwanted warm tones, particularly in blonde and bleached hair.

These pigments help maintain the hair's tone during the treatment process, but they do not replace toning services and do not cause a permanent change in hair color.

Yes. Sarah K has an official technical training program covering scientific fundamentals, hair analysis, standardized protocols, and specific guidelines for each product line. Training sessions led by Technical Educators are also conducted to ensure greater precision and standardization of procedures.

Yes. The line contains blue and violet cosmetic pigments that help neutralize the yellow and orange undertones that can appear during thermal treatments.

These pigments serve a cosmetic purpose and do not replace a specific toning treatment.

The choice of product and protocol should be made by a professional following a hair analysis.

Hair type, thickness, porosity, strength, chemical history, level of sensitization, and desired results must be considered to determine the most appropriate treatment and parameters.

On average, between 30 and 90 days. The duration may vary depending on the characteristics of the hair fiber, the specific protocol used, and the maintenance routine.

The results can last for up to approximately 6 months, depending on hair characteristics, the technique used, and maintenance care.

As a general guideline, we recommend waiting between 7 and 15 days after permanent coloring or bleaching.

The interval may vary depending on the condition of the hair fiber and should always be assessed by the professional in charge.

Yes. The strand test is an essential step before any straightening procedure.

It allows for the assessment of hair strength, the detection of potential chemical incompatibilities, the determination of parameters such as temperature and the number of passes, and the prediction of how the hair might respond to the treatment.

The test is especially important for hair with an unknown chemical history, multiple past treatments, a history of bleaching, or signs of damage or sensitivity.

No. Although it offers cosmetic benefits - such as shine, softness, emollience, and protection during the treatment - La Vie En Gold is a high-performance straightening protein and does not replace a dedicated hair reconstruction protocol.

For severely damaged hair, we recommend first restoring the strength and integrity of the hair fiber before undergoing any new chemical treatment.

Both treatments utilize alignment technology, yet they serve different purposes.

Brazilian Protein is recommended when the primary goal is a more intense and longer-lasting straightening effect.

Botox offers a milder action with a greater focus on cosmetic benefits, helping to reduce frizz and control volume while promoting alignment, softness, and a natural look.

The choice should be based on a hair analysis and the desired result.

There is no single recommended temperature for all hair types. The setting should be determined based on an assessment of the hair fiber.

As a guideline:

• 170°C to 180°C: extremely sensitized hair or when greater color preservation is required.
• 190°C to 210°C: fine, colored, or bleached hair.
• 210°C to 230°C: natural hair of average resistance.
• 230°C to 250°C: thick, resistant, and structurally intact hair.

The temperature, number of passes, and technique used should always be customized according to the hair's condition.

The Rio line was developed specifically for blonde, gray, and bleached hair; however, the temperature should not be determined solely by hair color.

There is such a thing as resistant bleached hair and extremely sensitized natural hair. Therefore, the professional must consider resistance, porosity, chemical history, strand thickness, sensitization levels, and the strand test result before determining the temperature.