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How to substantiate protecting effect of hair care product on external and internal hair structure ?
Hair is a constant victim of many agressions : water, sun, brushing, pollution, having shine and smooth hair with blow dryers and heating irons… The robust structure of its external layer, the cuticle, protects it. But as fantastic is this cuticle, we need to care of it…
Hair robustness comes from the cortex structure but its permeability, brightness, softness or even manageability arise from cuticle condition.