The follicular density to be implanted is highly variable; the higher the density, the thicker the result, and the lower the density, the larger the beard should be to cover the spaces. The quantity is determined factoring in the expectations of the patient, the size of the face, the design of the implantation, the square centimeters to be implanted, the quantity of FUs to be implanted per centimeter, the thickness of the hair to be transplanted, the amount of preexisting hair in the recipient area, and, mainly, the quantity of FUs that can be harvested from the donor area.