Cyclic Combing of Untreated and Bleached Human Hair: Analysis of the Time-Dependent Breakage of Hair Through Recording the Formation of Fiber Fragments

The study investigates the breakage of untreated and bleached human hair during cyclic combing, focusing on the formation of fiber fragments. It finds that friction is the main factor influencing fragment formation in straight hair, suggesting no direct connection between combing performance and tensile fatigue failure for this hair type. However, textured hair may exhibit more complex combing behavior. The research indicates that the total number of fragments after repeated combing can predict early hair failures and evaluate the effectiveness of conditioning agents, supporting claims about hair strength.