Results such as this can occur only after multiple sessions. The major reason for this is that grafts can only be placed within a certain proximity to the adjacent grafts so that each graft can have sufficient blood supply for nourishment. Generally speaking, it takes 2500 to 3000 grafts to cover a completely bald frontal forelock (roughly the area in front of a line running from the back of one ear over the top of the head to the back of the other ear). These grafts would consist of approximately 600-800 single hair grafts to the front scalpline and the balance of 3-6 hair grafts in the "interior." Whether it be 600 or 800 single hair, micrografts and 3 or 6 hair minigrafts would depend upon the person's hair characteristics. If doing the "follicular unit" approach, grafts averaging about 2 hairs, the total number of grafts required would of course be significantly higher. "Interior" vs. "perimeter" is also a useful distinction. Perimeter will consist of wherever a leading edge of exposed. This can be the front scalpline of course but also the partline and the crown if the crown will be left thin or untransplanted. The patient shown had light transplantation of his crown to explain the number of grafts over 3000. His hair characteristics were sufficiently favorable that thin coverage in the crown was an option. The more severe hair characteristics (see discussion of hair characteristics elsewhere on this web site) would not allow this option.