1. Skin type

If your skin and hair are anywhere from normal (not super oily and not super dry) to dry, you probably only need to wash it once or twice a week, according to a Columbia University health column. If you have a greasy scalp, you probably need to wash your virgin human hair more often.

2. Hair texture

Texture matters because it affects how quickly sebum works its way from your roots through the length of your virgin hair bundles with closure. Coarse or curly hair slows down sebum's spread, so if you have hair like this you may only need to shampoo once a week, say the experts at Columbia. On the other hand, people with fine, straight hair will likely need to shampoo twice a week or more.

Personally, I go about two days without washing my curly hair. In between shampoos, I rinse my hair, massage my scalp, and apply conditioner to the ends of my hair.

3. Styling

Another thing to consider is the paces you put your hair through styling and treating it. If your hair is processed or damaged by styling, you should wash it less frequently.

But that's something you'll have to find out for yourself. I've figured out what works for my hair purely by experimentation.

So don't be afraid to go a couple days without shampooing and see if you like what happens.

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How often you should wash your virgin hair