Structural Analysis of Macrofibrils in a Human Permanent Waved Hair by Scanning Microbeam Small-Angle X-ray Scattering Measurements.

It has been experimentally shown that hair subjected to permanent wave treatment quickly changes into uncurled hair during daily hair-care activities. However, the mechanism of curl fallout has not been clarified. In previous studies, the relationship between permanent wave treatment and disulfide bonds in hair has been studied.

Alkaline peroxide treatment induces acquired unruly hair by apparently affecting distinct macrofibrils.

Individual hairs can be inherently curly; however, bleach treatment can cause damaged hairs to acquire a curl, a phenomenon we term acquired unintentional unruly hair. Because there have been no reports concerning acquired unintentional unruly hair, the influence of bleach treatment with alkaline peroxide that produce this phenomenon was investigated. First, it was validated that the radius of curvature in many curly hairs is reduced upon bleach treatment.