OLAPLEX Nº.4C Bond Maintenance Clarifying Shampoo is a concentrated weekly cleanser for every hair type, texture, and porosity level. Its pH-optimized formula removes chlorine, heavy metals, hard-water minerals, pollution, excess oil, and product buildup while cleansing without stripping. By clearing these impurities, it helps restore softness, shine, and color vibrancy and supports the rest of a hair repair routine. It also helps reinforce bonds for more resilient hair. The vegan, color-safe formula is dermatologist tested and suitable for chemically treated hair. Use it weekly or whenever a deeper cleanse is needed.