Washing hair less often: miracle or mirage?

Washing your hair less often does not make it less greasy: spacing out shampoos does not "retrain" the sebaceous glands, and no serious study has shown that it does. The right strategy is to choose a gentle shampoo suited to your scalp, and to wash your hair as often as you need to. Here is what really happens on your scalp, and how to space out your washes comfortably if you want to.

Can the scalp regulate itself?

You have probably heard this advice before, on Instagram or over dinner: "Stop washing your hair every other day, and your scalp will regulate itself!" The idea is appealing, almost poetic, as if our scalp held some secret wisdom. In reality, it does not hold up.

What is sebum for?

Sebum is a perfectly normal secretion. Produced by the sebaceous glands, it protects, hydrates and lubricates the skin and hair. It is, in a way, your hair's bodyguard.

The problem is overproduction. When it gets too zealous, this bodyguard becomes sticky: oily roots, heavy, flat hair, and an urgent desire to hide it all in a bun. To understand where this excess comes from, read why is my hair greasy.

Does washing less often make hair less greasy?

Contrary to what you read on some forums, spacing out your shampoos does not retrain your sebaceous glands: their activity depends mainly on factors such as genetics and hormones. No serious study has shown that waiting two more days would make them produce less.

Waiting too long can even have the opposite effect. Sebum, dead cells and dust build up on the scalp, which can lead to:

• itching;
• dandruff;
• sometimes hair loss.

To better understand this ecosystem, read our article on the scalp.

How often should you wash your hair?

There is no single rule. Forget the military discipline of "one shampoo every five days, or nothing". The right frequency is the one your scalp needs: every other day if that is your rhythm, less often if your hair stays fresh for longer. And above all, stop feeling guilty.

What matters is how gentle the product is. Choose a non-aggressive shampoo, formulated for oily hair or sensitive scalps, and use it as often as necessary.

How to space out your washes comfortably

If you want to space out your washes, do it gradually and without forcing:

• Use a gentle purifying shampoo, such as our purifying solid shampoo with rhassoul, which helps regulate sebum so roots stay fresh for longer.
• Rinse with lukewarm or cool water rather than hot.
• Apply conditioner to the ends only, never to the roots.
• Avoid touching your hair constantly during the day.
• Listen to your scalp: if it itches or becomes uncomfortable, it is time to wash.

Frequently asked questions

Is it bad to wash your hair every day?

Not if your shampoo is gentle and suited to you. The problem lies rather with formulas that strip too harshly, whatever the frequency.

My hair gets greasy quickly: should I wait longer between washes?

Waiting does not reduce sebum production. It is better to choose a shampoo suited to oily hair and rethink the habits that make the problem worse, such as water that is too hot.

How do I know which shampoo to choose?

Our online hair diagnosis helps you identify your scalp type, and you can discover all our solid shampoos.

In short

• Sebum is useful: it is the excess that makes hair greasy.
• Spacing out shampoos does not retrain the sebaceous glands.
• Waiting too long can cause itching and dandruff.
• Wash your hair when you need to, with a gentle shampoo, and without guilt.

The goal is clean, light, shiny hair that can breathe and makes you want to toss it like in a 90s advert.