What is the main function of a base coat in nail care?

The main function of a base coat in nail care is to create a smooth surface and prevent staining. When applied before colored nail polish, the base coat helps to fill in any ridges or imperfections on the nail plate, allowing for an even application of color. This smooth surface is essential for achieving a professional-looking manicure.

Additionally, base coats often contain ingredients that help to protect the nails from the pigments in colored nail polishes, which can sometimes cause discoloration or staining. By acting as a barrier, the base coat ensures that the natural nails remain healthy and free from yellowing or other discoloration that can occur from prolonged exposure to certain nail colors. This protective feature is critical for maintaining the integrity and appearance of the natural nails over time.