To thin a fringe, use thinning shears or a razor comb to remove unwanted thickness. Identify the desired length and shape, sectioning hair if necessary. Hold scissors or comb perpendicular to hair shafts, cutting at an angle to create volume and movement. Use point cutting, slide cutting, or notching techniques for added texture. Regular trims and thinning help maintain a polished fringe, enhancing the frame of the face and overall hair style.