We recommend Liner Gel Polish for making precise and really thin lines. It is also a perfect choice for French ends, because the design of the brush and the quality of the material make it possible for the lines to merge into the surface. Smile while making smile lines, and straight, slanted or curved lines! IMPORTANT! Carefully slide the thin-tipped brush back into the bottle during use or at the end, because the material density of the Liner may deform it.