L’OREAL Professionnel PRO FIBER RECONSTRUCT Treatment – Mask restores for very badly damaged hair long-acting with a high level of damage: hair surface and cortex. Result: hair is restored from roots to tips. Intensive restoration of the structure of the hair. Food. Smoothing. Strengthening. Softness. Shine. Hair type: Very damaged hair. Discolored or dyed hair. Hair with damage to the internal structure.