A clean, healthy scalp promotes hair growth. 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.
Oily and fine or thin hair types should wash every one to two days. This schedule allows for removing buildup and the natural oils to stimulate hair health and growth. Wavy or curly hair and dry or damaged hair types should wash in the range of once every four to seven days.
"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."
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.
“The speed at which hair grows is determined by genetics but there are other factors that can affect the growth rate. Age, diet, stress, hormonal fluctuations, scalp health, hair care practices, medications and other health conditions can potentially influence hair growth,” said master hair colorist, Stephanie Brown.
“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.
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.
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.
“Washing it more does not cause your hair to grow less,” says Yates, noting that washing your hair less could lead to follicle damage, not the other way around. “A build-up of sebum and/or styling products can clog your hair follicles, leading to follicle damage and ultimately hair loss,” she adds.
Hair can stop growing or grow slowly for a variety of reasons including age, genetics, hormones, or stress. You may notice your hair stops growing in one spot or seems to be growing slowly on one side. There are plenty of treatment options for slow-growing hair, including: medication.
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.
Even if the hair does not feel oily, frequent shampooing is still essential to keep the scalp environment clean and healthy, so we wouldn't recommend going any longer than three to four days without shampooing.
Washing the hair less often can help the scalp remain healthy, prevent itching and flaking, and keep the hair soft and shiny. People with very oily scalps may develop acne on the scalp or along the hairline and may need to wash their hair more frequently to keep their hair looking clean.
Fine hair can easily get weighed down by oil and product buildup—so it requires washing a bit more often. “The goal is to keep it clean so it can maintain volume but to also nourish the scalp with a volumizing conditioner that won't weigh hair down," Cucinello says.
How Many Washes Should You Aim For? While this question truly depends on the nature of your hair and varies from every person, if you have thinning hair, try to wash your hair between 3-4 times a week if necessary; washing thinning hair just 3 to 4 times per week means doing so just about every other day.
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.
So, issues like thyroid problems, hormonal imbalances, etc. could stunt hair growth. Nutrition (weight fluctuation, crash or restrictive diets, high exercise and not enough protein, iron deficiency, etc.) also plays a role in how long your hair will grow.
While not as dense as its counterparts, the hair is less likely to experience hair loss or breakage. Asian hair is also the fastest growing, at over half an inch per month.
Lifestyle and diet changes to fix oily hair
Your diet should consist of foods rich in vitamin B, especially B2 and B6. It is believed that these components in your diet can help keep your sebum production in control. So, consider adding foods like leafy vegetables, pulses, and seaweed.