Olaplex Hair Protector Repair Strengthens No. 3 Size 3.3 oz Brand New Seal Authentic Olaplex No. 3 Hair Perfector is a highly regarded at-home hair repair treatment. It's designed to strengthen and repair damaged hair, reducing breakage and visibly improving hair health. This product is not a conditioner but a treatment that works by relinking broken disulfide bonds in the hair. Here are some key details: Size: 3.3 oz Benefits: Reduces breakage, strengthens hair, and restores healthy appearance and texture. Usage: Apply on damp hair before shampooing and conditioning. Leave it on for up to 10 minutes, then rinse and follow with Olaplex No. 4 Shampoo and No. 5 Conditioner. For best results, use once a week or two to three times a week for damaged hair