The density of one hair transplant cannot reach the normal hair density for the following reasons: 1. The hair transplantation technique itself does not create new hair follicles and does not increase the total amount of hair, but only redistributes the hair. If there are fewer hair sources available for transplantation, it will limit the number of hair transplants. 2, transplanted hair follicles need the surrounding blood supply in order to be viable, before transplantation, you need to punch holes in the transplantation area, this operation will destroy the local blood circulation, if the holes are too dense, the local blood circulation is severely damaged, the hair follicles are not easy to be viable. Therefore, you can’t punch too dense. 3, the common hair transplantation technique is to cut the flap in the donor area, generally speaking, if the width of a cut is more than 2, 5cm, it is more difficult to directly pull together and suture. The tension after suturing is greater and the scar formed is more obvious. Therefore, the number of hairs that can be supplied for transplantation at one time is somewhat limited. Because the density of normal hair is far more than what the human eye can perceive, a density equivalent to 1/3 to 1/2 of the normal hair density looks good enough to give a “dense hair” effect. Therefore, the results of hair transplantation are very good. If the patient is demanding, he or she can have the encryption procedure done 6-12 months after the surgery to get better results.