Damage from styling, heat, and coloring can cause damage to the hair cuticle making it more porous and further susceptible to damage. While traditional conditioners can smooth cuticle, Olaplex No. 3 treatment contains a unique ingredient called Bis-Aminopropyl Diglycol Dimaleate which actually repairs broken bonds in the hair. I color my hair and heat style often, and this product really makes a difference. I also have fine hair and find this product does not weigh my hair down like traditional conditioners and this allows me to style for volume.