OGX Straightening Brazilian Keratin Smooth Hair Mask 300 ml OGX Straightening Brazilian Keratin Smooth Hair Mask strengthens and softens your curly or wavy hair with coconut oil-keratin proteins-avocado oil and cocoa butter in its formula. It straightens your hair by helping smooth the hair strands. Sulfate-free OGX StraightenerBrazilian Keratin Smooth Hair Mask - helps your hair achieve a sparkling shine. For best results, use with OGX Straightener Brazilian Keratin Smooth Series. How to apply OGX Straightening BrazilianKeratin Smooth Hair Mask? Before using OGX Straightening Brazilian KeratinSmooth Hair Mask, wash and rinse your hair with the recommended shampoo. After rinsing, apply the hair mask towards the ends of your hair. Wait 3-5 minutes - then rinse your hair with plenty of water.