The brush determines the final look. Densely bristled brushes generally thicken lashes. Sparse bristles separate and lengthen lashes. Multi-tiered bristles help separate and thicken lashes. Fat brushes deposit more mascara onto lashes and are made to thicken lashes in one stroke.
Short bristles are best for getting short lashes to look longer.
Curved brushes coat all lashes from corner to corner in one stroke, reaching tiny corner lashes. Darkening only mascaras give you the most natural look, with no heavy mascara build-up. Thickening mascaras are made to increase the diameter of each lash for the most dramatic look. Lengthening mascaras separate and make lashes look longer for a classic look. Water-resistant mascaras generally hold up under tears, but come off during swimming.