TRESemmé Keratin Smooth Deep Smoothing Hair Mask rinse-out hair treatment 440ml is a deep conditioning treatment that helps to smooth and nourish frizzy, dry hair. It is infused with keratin and marula oil, which help to strengthen and protect the hair shaft. The mask is also free of sulfates, parabens, and dyes.To use the TRESemmé Keratin Smooth Deep Smoothing Hair Mask, simply apply it to damp hair after shampooing. Leave it on for 2-3 minutes, then rinse thoroughly. The mask can be used once or twice a week for best results.If you are looking for a deep conditioning treatment that will help to smooth and nourish your hair, TRESemmé Keratin Smooth Deep Smoothing Hair Mask is a great option. It is affordable and effective, and it is suitable for all hair types.