Olaplex's core technology utilizes Bis-Aminopropyl Diglycol Dimaleate, a patented molecule designed to relink broken disulfide bonds within the hair shaft. These bonds are crucial for structural integrity and are frequently damaged by chemical treatments, heat styling, and mechanical stress. By actively repairing these bonds at a molecular level, the process helps restore hair's internal strength and resilience, effectively reversing damage without merely coating the hair.

Olaplex No. 7 Bonding Oil provides heat protection up to 450°F (232°C). This is achieved through its lightweight, silicone-free formulation which contains ingredients that form a protective barrier. This barrier helps to minimize moisture loss and prevent the degradation of the hair's keratin structure when exposed to high temperatures from styling tools like flat irons or curling wands.

The 72-hour frizz control claim for Olaplex No. 7 Bonding Oil is most effective in moderate humidity levels. In environments with extreme humidity, consistently above 80% relative humidity, or during prolonged exposure to significant moisture, the protective barrier may be less effective as the hair shaft absorbs excess water. Hair porosity also plays a role; higher porosity hair may absorb moisture more readily, potentially reducing the duration of frizz control.

The No. 4 Shampoo and No. 5 Conditioner work through Olaplex's bond-building system to strengthen the hair shaft from within. Split ends occur when the outer cuticle layers fray and separate, often due to cumulative damage. By repairing the internal disulfide bonds, these products enhance the hair's tensile strength and structural integrity, making the hair shaft more resilient and less prone to fraying and splitting along its length.