Keratin Treatment at Home: What to Know Before You Start
An honest look at doing a keratin treatment at home: what “professional use” on a label means, the steps involved, and the safety points that matter most.
Start With the Label
Before anything else, check who the product is intended for. Smoothing treatments are sold in two broad groups: products labeled for consumer or at-home use, and products labeled for professional use.
The straightening kits in our store — the Hair Liss Perfect line — and the Excelencia pre-treatment products carry a professional-use label. We don’t currently sell a keratin kit labeled for at-home use. If you are not a trained stylist, we recommend having a licensed professional apply them.
A professional-use label is not marketing. It means the product was designed to be applied by someone trained to section hair, judge processing time for different hair types, control heat and work safely.
What the Process Involves
Whether it is done in a salon or not, a heat-activated smoothing treatment follows the same sequence. For Hair Liss Perfect, the directions are:
- Wash with a clarifying shampoo.
- Dry the hair and divide it into sections.
- Apply the treatment strand by strand, starting about 1 cm (⅜ in) from the root.
- Cover with a plastic cap and leave on for 40 minutes on fine hair or 60 minutes on thick hair. No aluminum cap, and no dryer to speed it up.
- Rinse with lukewarm water until the product is gone.
- Apply a heat protectant, blow-dry completely and brush smooth.
- Flat-iron strand by strand, with thinner sections for thick hair and lower heat for blonde hair.
Allow several hours. The care taken in the last two steps decides how even the result looks.
The Safety Points That Matter Most
- Ventilation. Work in a well-ventilated space. The U.S. Food and Drug Administration has warned that some hair smoothing products can release formaldehyde when heated, which can irritate the eyes, nose and throat. Read the ingredient list and warnings on any product you use.
- Follow the directions exactly. Don’t extend the processing time or add heat during it.
- Keep it off the scalp and skin. Apply from about 1 cm away from the root, wear gloves and avoid contact with eyes.
- Strand test first. Test a small hidden section before treating the whole head.
- Respect the iron. High heat burns skin and damages hair. Use the temperature in the directions for your hair type.
- Know when not to. Don’t use these products on children. If you are pregnant or nursing, or have a respiratory or scalp condition, talk to a healthcare professional first. Stop immediately if you notice irritation.
What Can Go Wrong
- Uneven results from sections that are too thick or product that isn’t applied evenly — the back of the head is hard to do on yourself.
- Heat damage from an iron that is too hot or too many passes.
- Dryness and breakage from re-treating lengths that were already treated. Touch-ups belong on the new growth only, every 3 to 6 months.
- Irritation from poor ventilation or product on the skin.
When a Salon Is the Better Choice
Choose a licensed stylist if your hair is bleached or heavily processed, very long or very thick, if this is your first smoothing treatment, or if you don’t have a well-ventilated place to work. A stylist can also tell you honestly whether your hair is in good enough condition to be treated at all.
If You Are Looking for an At-Home Option
Look for a product whose label explicitly says it is for at-home or consumer use, and compare its directions and warnings with the points above. For care that needs no heat sealing, consider conditioning products instead: hair masks, hydrolyzed liquid keratin and anti-frizz serums all make hair smoother and easier to manage with far less risk.