The primary role of hair care is to remove the dust, dirt and sebum which is continuously secreted to the skin surface. Inappropriate shampoos can cause hair to become weaker and breakable and to lose suppleness. If improper hair care becomes part of your daily routine, it will inevitably cause more severe damage to the hair. This is due to progressive damage to the hair follicle and complete removal of sebum from the follicle surface which may result in skin irritation and reactive (excessive) seborrhoea. A correct washing routine may help to eliminate substances which have a harmful effect on the hair follicle, replenish nutrients to the follicle and support reconstruction of the hair shaft.