Infused with patented olaplex bond building technology, this highly concentrated reparative mask adds shine, smoothness and body while providing intense moisture to treat damaged hair. Hair so visibly healthy, you can skip the styling. A single molecule, free of silicones and oils, dramatically improves the hair strength, protects from within, and provides immediate results. To use apply to clean, damp hair from mid length to ends. Use sparingly on the roots. Work through and leave for 10 minutes. Rinse thoroughly. Where apply to clean, damp hair and work through with fingers. When use weekly for best results. For all hair types, especially for those with visible damage. Olaplex products are thoroughly tested in house and by independent third party laboratories for safety and efficacy. This product testing includes the industry standard human repeat insult patch test hript, which tests for skin irritation or sensitivity. All olaplex products have passed the hript, meaning the products show no signs of causing irritation, inflammation, or sensitivity.