Hair preparation is a process that involves the use of various products to style and maintain the health of hair. RINSE is a five-letter word used to describe the act of washing hair with water or a cleansing product. GEL is a three-letter word used to describe a styling product that helps to hold hair in place. MOUSSE is a six-letter word used to describe a styling product that adds volume and texture to hair. All of these products are used to help create a desired look and keep hair healthy.