What it is: A professional-inspired, intensive treatment that primes hair for deeper repair, strengthens, and protects hair integrity leveraging the OLAPLEX™ patented bond-building technology.Hair Type: Straight, Wavy, Curly, and CoilyHair Texture: Fine, Medium, and ThickHair Concerns: - Damage/ Split Ends/ Breakage- Shine- Color SafeKey Benefits: - Primes hair to intensify benefits of No. 3 Hair Perfector (sold separately).- Strengthens weakened bonds deep within the hair strand.- Repairs hair from chemical, thermal, mechanical, and environmental damage.Highlighted Ingredients:- Bis-Aminopropyl Diglycol Dimaleate: Rebuilds broken and weakened bonds.Ingredient Callouts: This product is vegan, cruelty-free, and gluten-free.What Else You Need to Know: Use as the first step in a two-part at-home system with No. 3 Hair Perfector (sold separately) to strengthen and repair all types of damaged hair. No. 0 Intensive Bond Building Hair Treatment contains the highest concentration of the patented bond building technology of any Olaplex at home product. Olaplex products feature first-of-their-kind, patented, bond-building technology, which relinks the broken disulfide bonds caused by chemical, thermal, and mechanical damage to the hair. This formula is made to work with every hair type, providing real, structural repair that works from within.