Olaplex No. 0 Intensive Bond Building Hair Treatment is a professional-inspired pre-shampoo hair treatment designed to prime, repair, strengthen, and protect all hair types using Olaplex’s patented bond-building technology. This intensive hair repair treatment works deeply within damaged hair to help restore hair strength, improve resilience, and support healthier-looking strands. Best used as part of a two-step system with Olaplex No. 3 Hair Perfector, it helps target visible signs of hair damage caused by styling, coloring, and environmental stress. Its lightweight liquid formula saturates the hair evenly without heaviness, making it ideal for regular hair care routines focused on hair repair, bond strengthening, frizz reduction, and smoother, shinier, and healthier-looking hair.