Breakage is a structural problem. The internal bonds that give hair its elasticity — polypeptide chains and disulfide bonds — are fractured by bleach, heat, chemical processing, and chronic high porosity. A strand with compromised bonds has no stretch; it snaps under normal manipulation instead of recovering.
The professional solution is bond repair, not conditioning. Conditioning makes hair feel smoother temporarily. Bond repair reconnects the actual fractures. K18PEPTIDE™ (K18) and Bis-Aminopropyl Diglycol Dimaleate (Olaplex) are the two clinical actives that do this — working on different bond types, which is why using both in alternation delivers better results than either alone.
Hair thinning at the root is different from breakage. See Hair Loss & Thinning →