L'Oreal Professionnel Metal Detox Pre-Treatment in the 500ml size is an essential step to prepare your hair for coloring services. This professional-grade pre-treatment is formulated to effectively remove metal particles and impurities from the hair, creating a clean canvas for the hair color or chemical treatment. It helps to ensure that the color or chemical process is even and that the results are more accurate and longer-lasting. Metal Detox Pre-Treatment is a crucial step in any hair coloring or chemical treatment process to achieve the best and most consistent results.