Hair becomes dry when it has not received enough sebaceous secretions from the scalp when it grew. Its hydrolipidic film, which normally acts as a protective barrier, is then weakened. In such a state, the hair scales open, creating a feeling of rough hair. In addition, external factors such as pollution, sun, repeated brushing or regular use of hair straighteners can worsen this phenomenon. Lacking in fundamental lipids, the hair is coarse, its radiance tarnished. It requires a highly nourishing care to be properly hydrated, repaired and to regain its suppleness.