Olaplex No. 4 Bond Maintenance Shampoo

Olaplex No. 4 Bond Maintenance Shampoo brings the brand's patented bond-building technology to daily hair washing. Unlike traditional shampoos that merely clean, No. 4 actively repairs broken disulfide bonds in the hair shaft while removing dirt, oil, and product buildup. The sulfate-free formula cleanses effectively without stripping color or moisture, making it ideal for color-treated, chemically processed, or damaged hair. The shampoo has a rich, luxurious lather despite being sulfate-free—a rarity in gentle cleansers. Hair feels clean without that squeaky-stripped sensation. With consistent use as part of the Olaplex system, hair becomes noticeably stronger, smoother, and more manageable. Breakage is reduced and hair appears healthier overall. The formula is highly concentrated, so a little goes a long way—one bottle lasts several months with regular use. However, the premium price point is steep for a shampoo, especially when paired with the matching conditioner (No. 5). Those with very oily scalps may find they need to shampoo twice for adequate cleansing. The formula can also be protein-heavy for some hair types, requiring balancing with moisture treatments.