Olaplex No 0 Intensive Bond Building Hair Treatment 155ml is a professional-grade formula designed to strengthen and rebuild damaged hair bonds. This intensive treatment primes hair for deeper repair by penetrating the hair shaft to reinforce its structure, improving resilience and reducing breakage. Ideal as a first step in a multi-phase repair routine, it enhances shine, softness, and overall hair health, making it an essential addition to your restorative hair care regimen.