Nebraska Cosmetology State Practice Exam 2024 - Free Cosmetology Practice Questions and Study Guide.

Protective cream helps to protect the skin from irritation and stains around the hairline because it creates a barrier between the hair dye and the skin. Petroleum jelly, conditioner, and gel do not provide the same level of protection as they are not specifically designed for this purpose. Petroleum jelly and gel can actually make the staining worse by causing the dye to spread, and conditioner does not create a barrier to protect the skin.