[HIGHLIGHTS] True or False: do we need to shampoo twice to keep our hair clean?

Some experts recommend two shampoos to keep the hair clean. Others advise against washing them too regularly.

The more we clean the scalp, the more we remove the layer of sebum protecting it. Running your hair under cold water to make it glow is a good way to keep it clean. If you practice daily physical activity, or are heavily exposed to dust or pollution, a second shampoo could guarantee the eradication of these enemies of the hair. But this recipe only works if you only wash your hair once or twice a week.