S. Digel
Modern hair care is shifting from purely sensory conditioning towards structurally differentiated repair concepts. Hair is a complex fiber composed of cortex, cuticle and a lipid-based cellular membrane complex (CMC). Damage accumulates along the strand due to washing, UV exposure, heat styling and chemical treatments, leading to increased swelling, mechanical vulnerability, surface roughness and lipid depletion.
Modern hair care must respect the structural complexity of the hair fiber while addressing current trends such as skinification, hair cycling and the pursuit of “glass hair.” Repair has become a ubiquitous claim, yet it requires clear definition. In the context of hair care, repair refers to physically counteracting existing structural weaknesses by stabilizing the fiber, improving surface order and supporting lipid balance, rather than covalently reconstructing the hair.
