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.
An oily scalp is not entirely bad because minimal oil production is good for the health of your hair. However, excess oil can make your hair feel and look greasy.
Our hair follicles are surrounded by sebaceous glands. Overproduction of sebum leads to blockage, inflammation, and hardening in the pores. That, in turn, leads to the thinning of the hair with accompanying hair loss. So, oily scalp can cause the hair to fall out faster than it can grow back.
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.
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.
Every pore on your skin has a sebaceous gland, including your scalp. The sebaceous glands secrete an oily substance called sebum, which gives your hair its natural shine. Sebum keeps your hair healthy and smooth, and it keeps the hair from becoming dry and breaking.
While products like dry shampoo can help reduce scalp oil, you still need to wash your hair regularly for optimal scalp and hair health because not washing your hair enough can cause hardcore dandruff, irritation, clogged pores, breakouts, and even hair loss.
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.
A lack of the right nutrients, including vitamins A, C, D, and E, zinc, B vitamins, iron, biotin, protein, and essential fatty acids, may slow down hair growth or even cause hair loss. Fortunately, correcting a deficiency in any of these nutrients may help treat hair loss and promote the rate of hair growth.
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.
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.
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.
If you want to keep your hair at the same length, get it cut every 6 to 8 weeks. But if you want to grow it a little longer, cut it every 8 to 12 weeks.
On average, hair grows about half an inch per month. So, in two weeks, you can expect your hair to grow about one-quarter of an inch or half a centimetre every two weeks.
“Vitamins are essential for healthy hair growth and may help in preventing hair shedding and thinning,” says Michele Green, M.D., a cosmetic dermatologist in New York. “The best vitamins for hair growth include B vitamins, vitamin D, vitamin E, zinc, biotin and iron.
How fast does hair grow in a week? No matter how much you wish for your hair to grow, it's only reaching two to five millimeters per week, says Dawn Clemens, hairstylist and Founder of LarweHair.
She advises that after two to three months of the same routine, your hair will eventually adjust. But for many people with naturally curly or coily hair textures, daily washing is already a thing of the past.
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.”
Depending on your hair type, you can wait three to five days between washes, and we've got the scoop on how to survive the process while you're waiting for sebum production to slow down. We'll admit, the first two weeks are the most difficult, but after about week four, you should see a significant difference.
Those with fine or thin hair, however, may find their hair looks greasy after just one day. It's all to do with the amount of oil your scalp produces, as well as how well your hair can carry that oil.