How Often Should You Really Wash Your Hair?

Curated by Claudia Shannon / Research Scientist / ishonest

But bathing aside, how often should you wash your hair?

How shampoo works

Long hair? Short hair? Bald? It doesn’t matter — your body produces a waxy/oily substance called sebum from its sebaceous glands, which are also found on your scalp. This naturally oily substance spreads on your hair follicles to protect your locks.

ishonest No.501 - Frizzy Hair

No.501 - Frizzy Hair

Hair gets dirty, and even slightly smelly, just like the rest of our body. Shampoo contains cleansing agents — basically, detergents — that clean impurities off your hair.

Generally these cleansing agents are called sulfates or surfactants. They cleanse everything from smoke to dead skin cells from your mane. But, these detergents also strip your hair of its natural oils. So while shampooing does clean your hair, it can also make your hair and scalp dry AF.

Do you *have* to shampoo every day?

Nope. Lots of people shower every day and shampoo their hair out of habit. But that doesn’t mean it’s good for hair health.

Shampooing too much dries out your hair and scalp. It’s stripping those oils off, remember? Your hair and scalp need those natural oils for that shine and bounce you crave.

For strong and hydrated hair

Learn more

Due to overshampooing, some people find that their hair increasingly produces more oil over time. WTF? When your hair gets too dry, it’s constantly replenishing itself with that natural oil.

How often you have to wash your hair totally varies. Here are a few things to consider:


How much sebum is secreted from our sebaceous glands totally varies. If you have oily hair (which is actually an oily scalp) that looks greasy by the end of the day, sure, go ahead and shampoo more often.

Hair type

Your hair type matters, too. Fine, thin hair will need to be washed more often than thick, curly hair. Here’s how to figure out what hair type you have:

Your sweatiness and activity level
ishonest No.142 - Humectant

No.142 - Humectant

Working out makes you sweat, even on your scalp — hence why your do looks a liiiittle greasy after a spin class. (Allow us to introduce you to your new BFF, dry shampoo.)

However, humans are not meant to live on dry shampoo alone. If you sweat often from working out (or just, you know, life), you’ll want to wash your hair and scalp more often.

Dirt, pollen, and pollution

Unless you work on a construction site or at a flower nursery, you probably don’t think about this. But dust, dirt, pollen, and sadly, air pollution all get on our hair, and affect how dirty it gets. *searches air purifying plants*

Styling products

Hairspray, styling gel, dry shampoo, hair perfume… yup, these products build up and weigh down your locks. They can also irritate or damage your scalp. Not shampooing it out, just makes build up worse.

So, how often should you wash your hair?

Volume and structure for your hair

Learn more

There’s no one-size-fits-all approach to hair washing, and it’s def worth asking your hairstylist for help on your exact hair type. Here’s a handy-dandy guide to help you out figure out how often to wash your locks:

Fine, flat hair. Fine, flat hair usually needs to be washed every other day. Fine hair tends to look greasy more easily (no fair!).

Medium thick hair. Medium thickness hair is not thin (duh) and not thick (also duh). Wash your medium thickness hair about 2 to 3 times a week or so.

Thick hair. Wash thick hair 1 to 2 times a week. (Thick hair can feel like it takes forever to dry, so we feel for you!)

ishonest No.201 - Prevent Elasticity Damage

No.201 - Prevent Elasticity Damage

Wavy hair. Wash wavy hair can typically be washed about 2 to 3 days a week.

Loose curly hair. Loose curls can look flat if they don’t get enough moisture. Wash those locks 2 to 3 times a week.

Coiled hair. Coiled hair comes in all different types. You’ll want to consult on your curl types and subclassifications. Wash your hair 1 to 2 times a week.

Damaged hair. Damaged hair usually refers to strands that’ve been color-treated and, therefore, dry. You could wash as infrequently as once a week, so you don’t dry and damage your hair further.

Activates the microcirculation of scalp and strengthens the hair follicles to stimulate hair growth

Learn more

Oily hair. Because your scalp is producing a lot of oil, you’ll prob need to wash your hair every other day. Pro tip: Try using a clarifying shampoo once a week to help with your oil.

How long is too long to go without washing your hair?

Maybe you’ve been on a long flight or a camping trip and went a few extra days without washing your hair? That’s totally fine. You might feel gross, but it’s not going to irreparably damage your hair.

On the other hand, intentionally not washing your hair for weeks at a time and exclusively using dry shampoo could be a problem.

Generally, people should go about 3 days without washing hair. But the longer you go without washing your hair, the more oil, dust, dirt, and air pollution build up.

ishonest No.312 - Prevent Acne

No.312 - Prevent Acne

One more thing: Any type of hair can get knotted, tangled, or matted. Detangling spray, water, and conditioner can help loosen the strands up. But matted hair is really a combing problem, not a hygiene one. Ask your hairstylist for help if the knots or mats are really bad.

Signs you’re overwashing your hair

Yup, it’s possible to wash your hair too much. Here are the major signs you need to pump the brakes on your hair washing routine.

Dry, brittle hair

Limp, dry hair can sometimes feel like hay. It’s tough to style and breaks easily, leading to knots and tangles. To help dry hair you should also try to:

  • Lay off the hairdryer for a bit (or use it on low).
  • Get omega-3s from salmon or tuna for added shine.
  • Vitamins like biotin, vitamin A and iron make dry hair look alive.
Dry scalp or dandruff

Do you have an itchy scalp and small, white flakes in your hair? Congratulations, you may have a dry scalp.

Free your hair follicles

Learn more

If your itchy scalp is caused by red, scaly skin joined by larger white or yellow flakes, you probably have dandruff. Dandruff and dry scalp are actually two different issues — dandruff can be caused by oily hair or a fungus!

To combat dandruff and dry scalp, you can try:

  • washing your hair with a moisturizing cleanser
  • brushing your hair to stimulate the scalp
  • giving your scalp a gentle massage

Tips for between washes

There’s a couple things you can do to keep your hair looking great between washes:

  • Use the right hairbrush. Your hair follicles need some oil from your scalp for protection. Your best bet’s a natural bristle paddle brush made from boar bristles.
  • But don’t overbrush! That “100 strokes before bed” thing is a myth.
  • Keep your hair off your face so it doesn’t come in contact with makeup/ sweat/sunscreen. If possible, pile your hair atop your head in a messy bun or ponytail.
  • Wear a bonnet or silk scarf to sleep. Especially if you’re rocking coiled hair, a silk scarf or a bonnet help in the fight against friction and breakage.
  • Sleep on clean pillowcases. Hair products and makeup do rub off at night. Do your laundry!

Shampoo alternatives

Cleansing your hair doesn’t have to mean lathering up with shampoo every time. The “no poo method,” which means forgoing shampoo, can mean using these tactics:

ishonest No.313 - Prevent Acne

No.313 - Prevent Acne

Co-washing means washing your hair with a cleansing conditioner that moisturizes the hair. Co-washing is an especially popular method for coiled hair.


If you want to make like the “Beatles” and let it be, simply wash your hair with water — and only water. This is the best option for folks who don’t have oily scalps. Use lukewarm water. Hot water can lead to a dry scalp and itchiness.

“No poo” products

Some hair care brands also offer special cleansers that are technically not shampoo products, but can get your hair nice and clean.

Read more on: hair

Learn about unknown needs of your skin for free