For the average person, every other day, or every 2 to 3 days, without washing is generally fine. “There is no blanket recommendation. If hair is visibly oily, scalp is itching, or there's flaking due to dirt,” those are signs it's time to shampoo, Goh says.
Prolonged periods of not washing can cause cause buildup on the scalp, damaging hair and even impeding its ability to grow, Lamb said. Grime from dirt, oil and hair product can show up within four to six days for people with finer, straighter hair.
There's no single right answer to how many days you can get by without washing your hair. This comes down to your lifestyle, hair texture, and hair type. For many, two to three days is the most. However, by day five you should definitely give your strands a good wash.
Going a long time without washing your hair can cause a buildup of a yeast-like fungus called Malassezia on your scalp. Over time, this leads to a layer of dead skin cells that shed from your head in the form of oily, yellow-ish dandruff flakes. Dandruff can also make your scalp red, scaly, and itchy.
Oils and grime can be trapped, creating odor
When you don't wash your hair, oils may accumulate on your scalp. This can cause odor on the scalp and hair. If you use hair care products, these can also build up on your scalp and create odors, even if the products themselves smell good.
You might think it won't hurt, but washing your hair regularly is incredibly important for the health of your hair and scalp. "Shampooing removes sebum or oil that normally coats the hair shaft," says Brendan Camp, MD, a double board-certified dermatologist at MDCS Dermatology in New York.
She says it's more important to consider your hair type, texture and amount of oil production you usually experience. “I typically advise patients to keep to a standard hair washing schedule, whether it is three times per week, weekly or once per month, regardless of activity level,” she says.
Water is effective at washing away dirt, dust, and other water-soluble debris from the hair and scalp without stripping the hair of this sebum. However, Mamelak notes that if there are other oils in the hair (from a haircare or styling product, for example), a good portion of these will be left behind as well.
The primary reason that second and third-day hair is better has nothing to do with styling and has everything to do with hair health. Skipping a shampoo day lets your scalp relax, and it stops working overtime to produce protective oils. Your strands also breathe a sigh of relief and soak up that valuable sebum.
It may sound counterproductive, but a shower every day could be bad for your skin. Some dermatologists only recommend a shower every other day, or two to three times a week. Many people hit the shower at least once a day, either in the morning or at night before bed.
"Two to three times a week is best to 'wash' your hair with a shampoo," Paves says. "For the days in between, I recommend rinsing the hair with water alone. For a fresh feel and smell, you can condition from the mid-shaft out."
Washing your hair only once a week brings the benefits of natural oils into sharp relief. After all, many hair serums and treatments are meant to replicate the oils produced by the scalp, but excessive shampooing strips the hair of these valuable substances.
Rossi generally tells his patients they should wash their hair once or twice per week. But if you've had chemical treatments that can make your hair drier — such as bleach, perms or relaxers — you might want to wash it less than once weekly to avoid breaking or brittle hair or split ends, he said.
An overly greasy scalp can lead to uncomfortable itching and seborrheic dermatitis. It can even provide a feast for the fungus that causes dandruff. That said, you don't want to strip off all your oil. Your natural oils protect hair and are vital for a healthy scalp and lustrous hair.
Why Greasy Hair Looks Thin. According to hair expert Jean Will of NiaWigs, an oily scalp makes your hair look thinner because a buildup of excess oil at the base of your hair follicles causes strands to clump together. “Greasy hair looks thin because of its oily look,” she said.
I can honestly say they all smelled completely different. The aromas ranged from salty, sweaty, spicy and even sweet. One of my fellow cosmo students who only wet washed her hair once a week had hair which had the aroma of chocolate. The more days between washes, the stronger the chocolate smell.
What Is the No-Poo Method? The no-poo method is a hair-cleansing technique that removes shampoo from the equation, says Geeta Yadav, MD, a dermatologist in Toronto. Instead of using shampoo, followers of the practice use alternatives such as apple cider vinegar, a cleansing conditioner, or just plain water.
It also encourages the follicles to produce excess natural oils, making the hair greasier. Washing the hair with only water, on the other hand, does not strip the hair off the natural oils but removes the dirt and sweat. The neutral pH of water also prevents scalp infections.
The bottom line is that dirty hair does not grow faster than clean hair, so you might as well have a clean scalp and fresh hair. Your hair will look better, feel better, and be healthier as a result.
Hair growth flourishes from a clean, healthy scalp. The bottom line is that dirty hair doesn't grow any faster than clean hair, so you may as well have a clean scalp and fresh tresses. Your strands will look better, feel better, and be healthier, too.
If you normally wash everyday, it'll take time to get used to washing it less. So start by going an extra day or two in between your normal washes. Rinse your hair with water in between shampoos and try to build up to once a week. When your hair adjusts you'll notice a dramatic difference.
Anabel Kingsley, a trichologist from the Philip Kingsley clinic in London, agrees that hair does not clean itself. "Imagine if you didn't wash your face or underarms for a week - the same logic applies to your hair and scalp," she says. "They are likely to become coated in dirt, smelly, greasy and flaky.
Hair Washing Frequency and Tips
“I recommend washing your hair two to three times a week,” Dr. Icecreamwala says. “If your hair is dry, you may only want to wash it twice a week. If it is on the oilier side, every other day is recommended.”
Narrator: After six months to a year, all that gunk can clog up your hair follicles, which can prevent new hair from growing and, over time, ultimately lead to hair thinning or even hair loss. There's also a risk of your scalp getting infected from all the bacterial buildup.