Why is a Hair Transplant Permanent?

I would like to know how a hair follicle falls off. I was told that as DHT accmulates at the bottom of hair follicles hair falls off. This DHT is produmed by male harmones. Is this true? If this is the case even after hair transplantation DHT will be accumulating and it will cause the transplanted follicle to fall off. Then how is hair transplantation a permanent solution?

This is a good question. When hair is made by the body, it goes through many stages — from a single microscopic cell to a complex hair organ which contains hair, glands, nerves, blood vessels and muscles. Some people have genetic defects in some of their hairs on their head and men with male pattern balding have such defects in hair that correspond to the patterns of hair loss that they show. These defects do not allow the hair to grow from its single cell form into this complex organ which each hair follicles becomes. The defect is ingrained in each hair follicle that is impacted and it is never ingrained in hair follicles in the side and back of the head. As the transplanted hair comes from the sides and back of the head, the defect for making the hair fall out is not present in these follicles, so the transplanted hair grows. The hormone DHT causes the hair loss when the defect is present, but the hormone DHT does not affect the permanent hair from the sides and back of the head.