If your hair is looking dull and your color is losing its post-salon vibrancy, it may be the metals in your water taking a toll on your hair. L’Oreal Professionnel Serie Expert Metal Detox is here to help. This two-step system is designed to detoxify hair and neutralize metals trapped inside the hair fiber to protect the vibrancy of your hair color, while maintaining the softness and nourishment you love. Protect your color or balayage with the L’Oreal Professionnel Serie Expert Metal Detox Mask. With every hair wash, metal deposits can accumulate in the hair fiber, causing dullness, discoloration and even breakage. The innovative hair mask helps to protect the hair against metal-induced fading, working to maintain vibrancy. Hair is left feeling smoother and softer.