Bond repair is the technology that transformed professional hair care over the last decade. Hair is held together by disulfide bonds inside the cortex — and bleach, color, heat, and harsh chemistry break those bonds. When too many break, hair turns gummy when wet, snaps when dry, and refuses to hold shape.

Bond builders restore the connections. Olaplex pioneered the category with its patented bis-aminopropyl diglycol dimaleate molecule, but the field has expanded fast — L'Oréal's Smartbond, Joico's Defy Damage, Goldwell's StrandFire, KMS Moist Repair, Schwarzkopf's Fibre Clinix and BlondMe Bonding, and Matrix Total Results all bring different chemistry to the same goal: rebuild the bonds and give damaged hair its elasticity back.

ProHair carries the full professional spectrum — in-salon treatments, take-home masks, shampoos, conditioners, and leave-ins. If you've bleached, balayaged, double-processed, or fried your hair with heat, this is where you start.