Lock in your #BestHairDays with the OLAPLEX Intense Repair Trial Kit. The No.0 acts as an intensive repair booster that absorbs deeply into the hair, working in tandem with their best-selling No.3 to provide your most intense repair. Both treatments feature the brand's patented active ingredient Bis-Aminopropyl Diglycol Dimaleate, which works on a molecular level to seek out broken bonds caused by chemical, thermal, and mechanical damage, restoring a healthy look and feel to hair.