The main idea of the Korean approach to hair is simple: the scalp is skin. It has a barrier, sebaceous glands and a microbiome, and healthy hair grows from a healthy scalp. So care begins not with the length but with the scalp: how often to wash, with what and where to apply products.
The scalp is full-fledged skin, and care is built around it. The frequency of washing depends on oiliness, not on the calendar: an oily scalp can be washed even daily, dry/curly — less often. Shampoo — on the scalp, conditioner — on the length (not the roots). Wash gently, detangle wet hair carefully. Dry shampoo is a lifesaver between washes, but not a replacement for water.
01The scalp is skin
The scalp, like the face, has sebaceous glands, an outer layer and a microbiome. Sebum hydrates the hair, but an excess of it causes oiliness and feeds the yeast linked to dandruff; a lack of it — dryness and itching. The hair physically grows from a follicle in the skin, so the state of the scalp directly affects the hair. The conclusion: care for the scalp, not just the length.
02How often to wash the hair
Go by oiliness, not the "every other day" rule. Dermatologists advise washing when the hair becomes oily or product builds up in it. Straight hair with an oily scalp can be washed even every day; dry, textured or curly — less often, down to once every 1–2 weeks. Flakes have appeared — you may be washing too rarely. With age the glands work less, and washing is needed less often.
03Technique: where to apply what
The key rule: shampoo is applied to the scalp (it washes off sebum, dead cells and product residue), not the whole length — otherwise the ends dry out. Conditioner — the other way, on the length and ends, not the roots (otherwise it makes them oily). Massage with the fingertips, not the nails. Wet hair is fragile — detangle carefully, with a wide-tooth comb. Dry shampoo absorbs oil between washes but does not cleanse — do not use it to replace water for long.
- Washing on a schedule, not by condition. Everyone's scalp is different — go by oiliness.
- Shampoo over the whole length. Dries the ends; wash the scalp and only rinse the length.
- Conditioner on the roots. Weighs down and makes them oily; it is for the length and ends.
- Scratching with the nails. Injures the skin; massage with the fingertips.
- Living on dry shampoo. A long replacement for washing leads to irritation and seborrheic dermatitis.
04A basic set
Care for the length
Between washes
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05Common questions
Is it harmful to wash the hair every day?
If the scalp is oily and the hair is straight — no, daily washing is fine. For dry, curly and treated hair, frequent washing over-dries — they need it less often.
Why have flakes appeared?
A common cause is infrequent washing or unsuitable care, causing sebum and dead cells to build up. Sometimes it is dandruff/seborrheic dermatitis — there is a separate article on those.
Do I need separate scalp products?
Not necessarily. The base (the right shampoo on the skin + conditioner on the length) is enough for most. Scalp serums and exfoliants are added specifically for a concern.
Drawing on dermatological sources:
This material is educational and does not replace a consultation with a dermatologist.