According to Dr. Niraj Kakkar, says “Hair on top of the head can be DHT (Dihydrotestosterone) sensitive and are prone to fall. The rest of the hair in the body (like side hair on the head, back hair on head, beard, pubic hair, etc.) are DHT resistant. So theoretically, if we implant hair from these areas to the grafting area, they are going to be there life long and they do as well. But sometimes in some cases, the human body tends to reject 5-10% of the hair in due course of time. So, such small hair loss should easily be acceptable.