If you use hair color, a blow dryer, curling iron, flat iron, swim, do hot yoga...pretty much almost anything to your hair that could be causing hair damage, then you are going to want to invest in Olaplex 3 Hair Perfector. It is the best hair mask for damaged hair. The concentrated formula strengthens the hair from within, reduces hair breakage and improves its all over look and feel. This hair perfector soothes damaged, dry hair, compromised hair, protects its structure, and restores healthy appearance and luster. Use as a stand alone treatment or use with Olaplex 0 Intensive Treatment for an in-home salon hair treatment.