The Research and Innovation L’Oral teams developed specific tools to analyze the complexity of types of hair around the world. They went beyond the traditional classification of three hair types (African, Asian and European), by developing a scientific approach based on physical measurements of curl: the diameter of the curvature, the curl index, the number of waves and of tendrils.
50% of the world’s population has dark to very dark brown hair.
The study was performed on over 7,500 heads of hair in 23 countries. The result is a detailed classification of the world’s hair types in 8 categories, corresponding to a scale of curl, from the straightest (I) to the curliest (VIII), independently of any reference to ethnic origins.