OLAPLEX’s No. 0 Intense Bond Building Hair Treatment is best used as a two-part system with the No. 3 Hair Perfector to fortify and restore all types of damaged hair. This intensive, bond-building treatment primes hair for deeper restoration while helping rebuild hair bonds, strengthen and preserve hair's integrity. Key Benefits:Primes and repairsStrengthens and protectsIdeal for all hair typesDEA, aldehydes and formaldehyde-freeClinical Results:Scientifically proven:68% more repair* 3x stronger hair* *When used as a two-part system in just one use. Tip: Use as the first step in a two-part system with N°3 Hair Perfector. | Olaplex No. 0 Intense Bond Building Hair Treatment, 5. 2 fl. oz | Dermstore