More than half of the world's population currently lives in urban areas - and this is expected to reach 70% by 2050. While city living can be dynamic and exhilarating, it also exposes the hair and scalp to a range of factors that affect their beauty and vitality. Stress, pollution and hairstyling can cause the sebaceous glands in the hair follicles to produce too much sebum, which makes hair greasy or oily. And - less well known until recently -dust or pollution can form deposits on the scalp and hair fibres that gradually asphyxiate the important microbes living there, leading to skin discomfort, irritation and sometimes dandruff.
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