Hair density is simply how many hairs are added to your hair system base. The newer state-of-the-art bases that we offer virtually disappear allowing for thinner densities and avoiding the 'wiggy look' - very natural! We stagger the front hairs so there an not in a straight row--very natural. And we graduate the front hairline so that it is not a 'wall of hair' for realism.
Depending on what you like, you can choose a different hair Density for different areas of the base.