Seeing dull hair, tangles, or poor style retention? These could be signs of pollution or heat damage. Protect your hair from daily damage with this weightless, leave-in, silicone-free hair serum to shield hair from pollution for 48 hours and provide heat protection up to 450 degree F (232 degree C). With antioxidant-rich Red Algae Extract and scientifically proven OLAPLEX Bond Building Technology. , , How To Use: As the first step in your styling routine, apply a small amount of N.9 Bond Protector Nourishing Hair Serum to damp hair working upward from ends to roots. Use more hair serum as needed for longer, thicker hair. Use N.9 Bond Protector Nourishing Hair Serum on days you wash your hair and any days in between for added protection. N.9 Bond Protector Nourishing Hair Serum is for all hair types and textures.