Laura Sims Masque Lissant Smooth and Shine refers to a product associated with the brand "Laura Sims." Hair masks are deep conditioning treatments designed to provide intense moisture, nourishment, and targeted benefits to the hair. These masks often have moisturizing properties that can help improve the overall health and appearance of the hair. To use a hair mask like Laura Sims Masque Lissant Smooth and Shine, it is typically applied to clean, damp hair after shampooing. The mask is usually distributed evenly throughout the hair, focusing on the mid-lengths and ends. It is recommended to leave the mask on for the specified amount of time, allowing the ingredients to penetrate the hair shaft and provide deep conditioning. Afterward, the mask is rinsed out thoroughly.