Hairstyles are an important groom for women. In particular, women are sensitive to fashion, and various hairstyles have become popular with the history. For each hairstyle there is a suitable hair-styling agent. Hairstyles with chemical reactions and heating will cause more hair damage. The damage to the hair surface can be determined by “surface observation using SEM” or “measuring the coefficient of friction”. The damage to the surface of the hair tends to roughen the surface and increase the coefficient of friction.
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