How often should hair be washed according to science?

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You’ve probably already wondered how often you needed to wash your hair per week for example. The issue is thorny. It is actually so common that this is the first suggestion that appears when you type “How Often” in Google (in front of “making henna” and “drawing her milk” ). Over time, our hair gradually becomes brighter, darker and greasy. How is it possible ? How often should you wash them so that they are not greasy?

The root of the problem

Your hair becomes fat for the same reason that your face becomes fat: the glands in the skin produce a fatty substance called sebum. Sebum is what moistens the hair and prevents it from drying out. The glands that produce sebum (called sebaceous glands) are located next to the roots of hair in the layer of skin called dermis. The channels of the sebaceous glands lead to the hair follicle. This is how the sebum comes out of the skin and goes on your scalp.

How often do you wash your hair best?

Although the answer is different for everyone, no one should need to wash his hair every day. Washing them too often, in fact, can do them more harm than good. This is paradoxical, but people who wash their hair much more often to get rid of the fat will dry out the scalp, encouraging the production of more sebum, and therefore fatty substance.

In addition to avoiding washing your hair every day, there are other things to keep in mind when trying to determine the “right dose” of washing for you. Here are the three main factors to remember:

1. The type of skin . If your skin and hair are completely normal (not very fat and not very dry), you only need to wash them once or twice a week, according to Columbia University . If you have a greasy scalp, you probably need to wash your hair a little more often.

2. The texture of the hair . The texture is important because it determines the speed of sebum to make its way from your roots to the end of the hair. The frizzy or curly hair slows down the spread of sebum, so if you have “coarse” hair, you will only need to shampoo one week, experts at Columbia University say . On the other hand, people with fine and linear hair will probably need to do a shampoo twice a week or more.

3. The hairstyle . Another thing to consider is the pace you have to stylize your hair and treat it. If your hair is treated or damaged in styling (gel, products …), you should wash them less often. But it is up to you to discover what is best for you by experiencing different rhythms per week.

It must be remembered that the hair must be washed at least once a week and maximum three times according to the criteria stated above. Do not hesitate to stop your shampoos for a few days to see what happens with your hair before finding the right rhythm.

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