The kiss proof lip liners stay on your lips for up to eight hours. The highly pigmented texture glides onto the lips easily and evenly without making them feel dry. In addition to the retractable mine, the small sharpener at the end of the pencil ensures precision. The kiss proof lip liners stay on your lips for up to eight hours. The highly pigmented texture glides onto the lips easily and evenly without making them feel dry. In addition to the retractable mine, the small sharpener at the end of the pencil ensures precision.