How Often Should You Wash Your Hair: Expert Insights and Research-Backed Guidelines

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How Often Should You Wash Your Hair

When it comes to personal care, few questions are as universal as how often to wash your hair. It’s not just about convenience or aesthetics — it’s a core component of maintaining the health, vitality, and balance of your hair.

Luckily for you, we’ve consulted the experts and delved into scientific research to discover the elusive sweet spot for hair-washing frequency.

The Science Behind Hair Washing

Dr. Sarah Johnson, a dermatologist specializing in hair health, explains, “Our scalps produce sebum, a natural oil that nourishes and protects hair. However, excess sebum can lead to an oily scalp.” This is what happens if you go too long between washes and your hair starts looking wet (yuck).

On the other hand, according to a study published in the International Journal of Trichology, washing your hair too often can strip your scalp of its natural oils, which can dry it out or cause it to increase oil production to compensate.

The type of hair you have, your lifestyle, and the products you use can all influence your scalp’s natural oils and how often you should wash your hair.

Factors That Impact Hair-Washing Frequency

Hair type and texture are key factors. “Fine hair tends to become greasy more quickly, while curly or coarse hair often struggles to distribute natural oils evenly,” says Jane Smith, a hair care expert with 15 years of experience. So, for those with corkscrew curls, you may be able to put off shampooing for longer. Research in the Journal of Cosmetic Science indicates that hair porosity can also affect how quickly your hair becomes oily.

Trichologist Dr. Lisa Miller highlights some environmental factors that can also have an impact: “If you’re exposed to pollution or sweat regularly, more frequent washing might be necessary.”

Expert-Recommended Guidelines

Dr. Emily Davis, a hair and scalp specialist, gives this general guideline: “For most people, washing every two to four days strikes a balance between scalp health and hair appearance.” She adds that sulfate-free shampoos are gentler on the scalp, while products containing harsh sulfates can strip too much oil.

In an interview with Women’s Health, Dr. Michelle Lee says to consider your lifestyle. “If you’re physically active, you might need to wash more frequently to remove sweat and prevent odor.” So if you like to get your workout on, heed this warning.

Listening to Your Hair’s Needs

Take a trial-and-error approach, advises Jane Smith. “Pay attention to how your hair feels and looks. If it’s too greasy or dry, adjust your routine accordingly.”

You don’t have to stick with the same grind forever. Experiment by going different lengths of time between washes and note how your hair looks and feels in response.


There’s no one-size-fits-all answer to how often you should wash your hair. It can vary depending on hair type, lifestyle, and environmental factors. For most people, the sweet spot is between two to four days, but you may fall outside the norm.

Explore your hair’s unique needs, listen to expert advice, and adapt your routine as necessary. A holistic approach to hair care will help you nurture healthy locks that reflect your personal vitality.


International Journal of Trichology. “Shampoo and Conditioners: What a Dermatologist Should Know?” (2015). Link 

Journal of Investigative Dermatology Symposium Proceedings. “Environmental Exposures and the Skin” (2018). Link 

Journal of Clinical and Aesthetic Dermatology. “Cleansing and the Role of Cleansing in the Prevention of Skin Conditions” (2016). Link 

Megan Baker

Megan Baker is a copy editor from Chicago, Illinois with a bachelor of arts in psychology. She loves reading, hiking, and cozying up in her living room to watch psychological horror films with her husband, daughter, and cat.

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