“Regardless of how your hair feels, though, don't go longer than 14 days, ever,” Lamb says, who doesn't buy in to the total 'no poo' movement. From a medical perspective, Goh says some of her patients only wash their hair once a week.
"The average individual can typically go 2 to 3 days without shampooing their hair. However, if your hair is visibly oily, you may not want to wait that long," she says. "Usually, you can go longer without washing your hair when your hair is styled up, but no one should ever go more than 14 days."
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.
But you should wash it at least every two to three weeks to keep your scalp and hair clean and healthy.
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.
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.
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.
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.
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.
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.
"If your skin tends not to be dry, you could extend it to every other day or so." If you take it from a certified germ expert, though, you can skip showering for as long as you wish.
shampoo can strip your hair of natural oils, and using heat products on your hair over and over again causes further damage and breakage, so washing your hair only once a week actually helps keep it in great condition.
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.
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.
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.
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.
You'd smell
Unsurprisingly, a person would develop quite a funk after 365 showerless days. Rokhsar said your stench likely would come as a result of the bacteria and dead skin accumulating on you. After a year, he said, you'd have a build-up of skin stratum corneum, or dead skin on top of your skin.
How often should a person wash their hair? People with oily hair or who use hair care products daily should consider washing their hair once every 1–2 days. People with dry hair can wash their hair less frequently. Those with textured or coily hair should only wash it once every 1–2 weeks.
If you wash your hair every day now, try going every other day for a week. Once your hair and scalp get used to that (usually about a week process) work on extending your wash by one more day and stay there until your scalp gets used to it again. You'll be able to tell by the amount of oil your scalp produces.
Hair training is the process of gradually prolonging the time in between wash days, working up to a 30-day gap. The theory is that your scalp will adjust to fewer washes and produce less oil, meaning your hair won't get greasy so quickly.
Dr Aragona says it usually takes around six weeks for hair to adjust to the process and for the natural oils in the hair to balance out. 'You will notice your hair becoming much greasier as the weeks go on,' he explains.
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 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.
The average person loses 50 to 100 hairs a day, but it really depends on length and thickness of the hair. People with shorter or thinner hair appear to shed less. On days when people with long or thick hair wash it, they could shed between 150 and 200 hairs.
“Shampoo less and your hair will be more hydrated,” they said, which helps promote thickness. “Be sure to use sulfate-free products to preserve your hair's natural oils.