What happens outside the body decides how many follicles survive.
A follicle leaves the donor area and is planted in the front. What happens in between decides the result.
Outside the body, a follicle has no blood supply and no oxygen. The longer that lasts, the lower the survival rate. So grafts are held in a preservation solution at low temperature, and the team works fast and in an organised sequence — organised, not rushed.
There is one stage that matters more than people realise: under the microscope, grafts are sorted by how many hairs each one contains. Single-hair grafts go into the front hairline so the edge reads soft and natural, while three- and four-hair grafts go further back to build density.
That sorting is the difference between a hairline that looks natural and one that looks transplanted.
What does your case actually need?
The video explains the general rule. The number that applies to you is settled after an examination — the grafts your case actually needs, not a figure quoted before we have seen you.