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not paulie_walnuts
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https://www.rahalhairtransplant.com/many-grafts-need-full-head-hair/
I know that I need to transplant above 40 grafts cm/2 (roughly) to create the illusion of hair.
Though I find that 50-70 grafts cm/2 achieves maximum fullness & density… so you can style your hair as you wish — long, short, parted, or “messy”.
http://shapiromedical.com/learning-center/understanding-density-2/
Another concept that is important to understand is the concept of “social observation” vs. “critical observation”. A hair transplant that achieves a density of 40-50 FU/cm2 will achieve social fullness, which means that the patient will look full most social situation. This includes casual observation from across the room to about a foot away. It is not meant to eliminate the ability to see any scalp under all“critical” observations which mean very close up, orparted. If one critically examines the scalp of people without hair loss, some scalp can be often seen.Patients who agonize about never seeing any scalp under any situation have unrealistic expectations about the purpose of hair transplants and will never be satisfied. A patient can be made to look full under most situations… but the scalp can be found under critical close up observation
50-60 grafts per cm^2 is the most any ethical surgeon will do, so if they're doing that many you can be sure you're getting the best density possible with a transplant
for comparison:
The crown is the region that is most densely packed with hair follicles. For the crown of the scalp pre-puberty, the density is 250-400 hairs/cm^2. In adults the sides and back of the scalp may have a hair density as low as 150/cm^2.