Protective treatment for technical services Fiber Fix Advanced professional treatment that performs a protective and restorative action on the hair fiber during technical services (mixed with coloring, bleaching, perming and straightening). It penetrates the hair during the chemical process, protecting and restructuring the fiber from the inside. The hair appears regenerated, extraordinarily shiny, strong and vital. Does not alter the color result or the lightening power. Use: Follow the information in the leaflet.