Why should you wash your hair?
Sebum plays an essential role in the hydration of hair and skin, allowing them in particular to resist external aggressions such as water or wind. Without sebum, the skin would dry and peel prematurely, exposing young cells to the outside elements. Unfortunately, the build-up of sebum can grease the scalp and hair, which is why it is recommended that you shampoo regularly. But how do you know how often to wash your hair?