Frizz is hair with an open cuticle: moisture from the air gets in through the lifted scales, the fibre swells unevenly, twists and stands up. Humidity is therefore only the trigger; the cause is the state of the hair's surface. Ending it for good takes two things: closing the cuticle and sealing it. The whole protocol below follows from that.
Why does hair frizz?
The cuticle is made of keratin scales overlapping like roof tiles. When they lie flat, they form a relatively watertight barrier: little moisture from the air gets in, the hair keeps its diameter and stays smooth.
When the fibre is damaged or dehydrated, those scales lift. Moisture rushes in, the hair swells only in places, and that uneven deformation is what you see as a halo of unruly little hairs. The more humid the air, the more the effect builds, hence those disastrous rainy days.
It is also why some people get frizz even in dry weather: their fibre is so porous that the little moisture available is enough. If that is your case, start with the porosity test.
The 6 habits that manufacture your frizz
Before adding products, remove what makes things worse. These six habits open the cuticle every time you repeat them.
| The habit | Why it makes things worse | What to do instead |
|---|---|---|
| Washing with very hot water | Swells the fibre and lifts the scales | Lukewarm water, final rinse with cool water |
| Detergent shampoo | Strips the natural protective film | A gentle cleansing base |
| Rubbing with a terry towel | Mechanically ruffles the cuticle | Blotting with microfibre or a t-shirt |
| Brushing dry hair | Breaks the fibre and creates static | Detangling in the shower, with conditioner on |
| Excessive heat | Degrades keratin, leaves the fibre lastingly porous | Moderate heat, cool-air finish |
| Cotton pillowcase | Rumples hair for eight hours a night | Silk or satin |
Fixing these six points already cuts frizz noticeably, without buying anything.
The washing and drying protocol
- Gentle shampoo massaged into the scalp only.
- Generous conditioner on the lengths: this is what closes the scales and creates the first barrier against humidity.
- Detangling with a wide-tooth comb while it is on, never on dry hair.
- Final rinse with cool water to tighten the cuticle.
- Blot to squeeze out water, then leave-in on still-damp hair. This is the key moment: it seals moisture inside and ambient humidity outside.
- Drying on moderate heat, nozzle pointed downwards, following the direction of the scales. Never against them.
- A blast of cool air on each section to set the closed cuticle.
If you let hair dry naturally, stop touching it while it dries: every time you handle damp hair you create frizz.
Which actives close the cuticle?
Three families work, and they are not interchangeable.
- Hydrolysed keratin treats the cause: it fills the gaps in the cuticle and smooths the scales. It is the only active that improves the real condition of the fibre rather than masking it. Its mechanism is set out in our article on hydrolysed keratin.
- Humectants such as Sodium PCA or glycerin: hair moisturised from within stops drawing moisture out of the air.
- Antioxidants and light lipids, vitamin E and shea butter, which protect and soften.
The /REVEAL Shine Mist brings these three families together in a texture that lays down an even veil without weighing hair down. On a very porous fibre, add the /REPAIR Mask every week: the less damaged the fibre, the less it frizzes.
Frizz, baby hairs or breakage?
All three look alike and none is treated the same way.
| What it is | Where you see it | What to do | |
|---|---|---|---|
| Frizz | Normal-length hair deformed by humidity | All over the head | Close the cuticle |
| Baby hairs | Genuinely short hairs still growing | Around the hairline | Nothing, they are healthy: style them |
| Breakage | Hairs snapped part-way along their length | Often halfway down | Protein supply and gentle handling |
If your frizz comes with breakage, split ends and a rough feel, the issue goes beyond frizz: run the full diagnosis with the 10 signs of damaged hair.
Day to day: touch-ups, night and humid weather
- During the day: two spritzes of mist on the unruly areas, smoothed down with your palm. Avoid water, which restarts the swelling-then-frizz cycle.
- At night: a silk pillowcase, and for long hair a loose braid or a loose high bun.
- In very humid weather: apply the leave-in more generously in the morning, it works like a raincoat.
- On curly hair: never brush dry, redefine curls with your fingers using the mist. Their spiral shape prevents sebum from coating the lengths, which makes them naturally more prone to frizz.
Frizz: the essentials
- Frizz is a symptom of an open cuticle, not a genetic sentence.
- Humidity triggers it, porosity allows it. Porosity is what you act on.
- Leave-in goes on damp hair, that is the step that seals.
- Drying against the direction of the scales undoes everything else.
- Allow two to three weeks of the protocol for a clear drop, longer on a very damaged fibre.
Frequently asked questions about frizz
Why do I get frizz even in dry weather?
Because the cause is not the weather but the state of your cuticle. A very porous fibre frizzes in any conditions: lifted scales and breakage create those little standing hairs regardless of ambient humidity.
Is frizz a sign of damaged hair?
Often, especially when it comes with breakage or a rough feel. But some healthy hair frizzes simply from dehydration or from being naturally curly. A simple test: if your frizz drops noticeably after a mask, the fibre mainly needed care.
Does air-drying prevent frizz?
Not necessarily. Air-drying while touching your hair, or in humid weather, generates as much frizz as a scorching blow-dry. The ideal remains leave-in on damp hair, then drying on moderate heat directed downwards.
Are oils effective against frizz?
They smooth temporarily by coating the fibre, but they quickly weigh fine hair down and repair nothing. A mist combining keratin and humectants acts on the cause while staying light.
Does permanent straightening solve the problem?
It masks the symptom by reshaping the fibre at high temperature, but it lastingly weakens the cuticle, which makes porosity worse in the long run. A cosmetic keratin treatment does not straighten and works the other way round.
How long does it take to get rid of frizz for good?
The right habits improve the result from the very first wash. Lasting disappearance follows the repair of the fibre: three to six weeks of a regular routine depending on how porous your hair was to start with.
Sources
- Robbins C. R., Chemical and Physical Behavior of Human Hair, 5th edition, Springer, 2012.
- Gavazzoni Dias M. F. R., "Hair Cosmetics: An Overview", International Journal of Trichology, 2015.
Article written by the KERA NEXT editorial team. Individual results: the outcome may vary depending on the nature and condition of your hair.