How long does the hair straightening effect last?

The effect lasts between 3 to 6 months, depending on hair type, aftercare, and quality of the product used. More porous hair may have shorter duration.

Can I do hair straightening on bleached hair?

It's possible, but requires careful professional evaluation. Bleached hair is more fragile and may need preparatory treatments before straightening.

Does hair straightening cause hair loss?

When done correctly, it doesn't cause hair loss. However, inadequate applications or poor-quality products can damage the strand and cause breakage, which can be confused with hair loss.

Can I color my hair after straightening?

Yes, but it's recommended to wait at least 15 days after straightening. Coloring should preferably be done after straightening to avoid color changes.

Can pregnant women do hair straightening?

It's not recommended during pregnancy, especially in the first trimester. Always consult your doctor before any chemical treatment during pregnancy.

How do I know if the product contains formaldehyde?

Check the ingredients list (INCI) on the label. Formaldehyde may appear as formaldehyde, methanal, or formic aldehyde. Formaldehyde-free products should clearly indicate this information.

Hair Straightening: Myths and Truths About Chemical Smoothing

Hair straightening is one of the most sought-after hair treatments, but also one that generates the most questions. Between myths and truths, many people are confused about the real effects, risks, and necessary care. This complete guide clarifies all your doubts about chemical hair smoothing.

What really happens to hair with straightening

Hair straightening is a chemical treatment that temporarily alters the internal structure of hair. Contrary to what many think, it doesn't permanently "break" hair bonds like traditional chemical relaxation.

The process works through the application of products that penetrate the cuticle and act on the hair cortex, reducing volume and natural wave. The heat from flat ironing seals the treatment, creating the desired smooth effect.

Main changes that occur during the process:

Temporary opening of the cuticle for product penetration
Action on the hair cortex to reduce waviness
Heat sealing to fix the result
Formation of a protective film around the hair strand
Reduction of porosity and increased shine

Main myths and truths about hair straightening

We've separated the main myths and truths about hair straightening so you can make an informed decision about this treatment:

❌ All hair straightening uses formaldehyde

MYTH. There are formaldehyde-free formulas on the market. Products with glyoxylic acid, ammonium thioglycolate, or other substances can provide straightening without formaldehyde. Always check the composition.

✅ Straightening can be done on any hair type

TRUTH. It works on straight, wavy, curly, and coily hair, but results vary. More textured hair may need more sessions or stronger products.

❌ Straightening washes out completely with shampooing

MYTH. The effect gradually diminishes over 3-6 months, but doesn't disappear completely just with washing. Hair progressively returns to its natural state.

⚠️ Straightening always damages hair

DEPENDS. When done correctly by a qualified professional with quality products, damage is minimal. Problems arise with inadequate applications or low-quality products.

✅ Straightening can fade hair color

TRUTH. The chemical process can alter or fade artificial colors, especially lighter tones. It's recommended to color hair after straightening.

✅ Flat ironing isn't always necessary after straightening

TRUTH. Hair with light waves may become straight with just blow-drying and brushing. More textured hair may need flat ironing to maintain the effect.

Factors that influence results and risks

The success of hair straightening depends on several factors that should be evaluated before the procedure. Understanding these elements helps set realistic expectations:

Hair condition before treatment

Level of existing damage and porosity
History of previous chemical treatments
Natural hair type and texture
Presence of coloring or bleaching
Overall scalp health

Quality of the procedure

Experience and qualification of the professional
Quality of products used
Proper application technique
Temperature and timing control
Guided post-treatment care

How to prepare hair and post-treatment care

Proper preparation and aftercare are fundamental for the success and durability of hair straightening:

Preparation before treatment

1Avoid washing hair 24-48h before the procedure
2Don't do other chemical treatments in the 2 weeks prior
3Inform the professional about allergy history
4Perform a strand test if it's your first time
5Deeply moisturize hair the week before

Essential post-straightening care

Don't wash hair for 72 hours after treatment
Avoid tying or braiding hair in the first days
Use sulfate and salt-free products
Apply moisturizing mask weekly
Protect from excessive heat with thermal protectants
Avoid prolonged sun exposure and seawater
Sleep on silk pillowcase to reduce friction

Prevention and maintenance of straightened hair

Keeping hair healthy after straightening requires specific care and preventive habits:

👩‍💼

Choose a qualified professional

Research references, check certifications, and ask to see previous work. A good professional makes all the difference in the result.

🧴

Invest in quality products

Use sulfate-free shampoos, nourishing conditioners, and masks specific for chemically treated hair.

📅

Maintain care routine

Regular hydration, thermal protection, and periodic cuts keep hair healthy and the straightening effect longer.

Hair Straightening: Myths and Truths You Need to Know

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