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A keratin hair mask serves as a deep-conditioning treatment that adds keratin to hair. Keratin, a protein, makes hair stronger and smoother. This mask helps fix damage from heat styling, chemical treatments, or environmental factors. It works to replace lost keratin in the hair shaft, which leads to hair that's smoother, shinier, and easier to manage. People leave these masks on their hair for 10 to 30 minutes before washing them out. Those with frizzy, dry, or damaged hair who want to boost their hair's health and looks find these masks useful.