What happens if you stop using shampoo on your hair for a year?

I read a article on internet about this :

When we got the skinny on the best way to wash hair, our biggest takeaway was that people don’t need as much shampoo as they think they do. In fact, many salons are debating whether shampoo is essential at all. “It’s something that’s being talked about a lot right now in the beauty industry,” said organic stylist Kristina Louise Welzien. “People are having these predictions that shampoo will no longer be needed at some point.”

We decided to test that theory with a little experiment of our own—what happens when you stop using shampoo?

The Hypothesis

Giving up shampoo for 30 days can help regulate oil production, improving the condition of hair and scalp.

Kristina’s shampoo expertise helped shape our strategy. “If we use anything that’s too astringent or too cleansing and we use it too often, it can actually have a reverse effect,” she said. In layman’s terms: the more often you wash your hair, the more oil your scalp tends to produce.

The Subjects and the Experiment

Two of our writers courageously volunteered to stop using shampoo for 30 days. To help them in their journey, Kristina created individualized regimens for each of them based on their hair type and styling challenges.

Kristina’s instructions: Aimee struggles with what Kristina says is a common result of over-shampooing—a combination of dryness and oil. She told Aimee to rinse her hair most days, and then condition the ends. “It’s [also] important to give a day or [so] between rinses when you’re not messing with it at all.”

To prevent oily roots, Kristina advised brushing or combing hair daily to keep the oils distributed, and to use a hair powder or dry shampoo. Aimee was told to take it easy on styling products, and to rinse her scalp once a week with an apple cider vinegar blend (see the recipe below) to avoid product buildup.

Aimee’s observations:

Week one: “Greasy, greasy, greasy. I rinsed it with apple cider vinegar [two days in a row] but it didn’t help … I feel like everyone can see how gross my hair is.”

Week two: “I broke down and got the grease out with castile soap (I used the bar, not the liquid), then rinsed with apple cider vinegar. I also bought a boar-bristle brush … to help distribute the oils better. Even [my husband]’s noticed how great my hair looked … I f***ing love it.”

Week three: “I don’t think I’ll ever buy a bottle of shampoo again.”

Day 30: “I have not had a bad hair day since I got out of the greasy phase of this experiment.”