Shampoo cleans the dirt that builds up in the hair, removes the oil produced by the sebaceous glands, scalp flaking, and the pollutant particles that settle on the hair every day. It is important to use a shampoo suited to the amount of oil in each hair type (normal, dry, or oily) and to the desired treatment (volume, anti-dandruff, shine, anti-frizz, curls…).