Pretty intriguing transformation, apparently according to the barber who made this video said he uses "Hair Building Fiber (Thick Fiber)" which contains keratin charged with static electricity that sticks to your hair to bring out a more natural look. Let's hope that after this guy's experience it doesn't rain on his wedding day.
Really amazing what he did but I personally wouldn't do it. If everyone knows me as balding why suddenly show up with hair… it would make me look as if I'm wearing a wig plus it would distract from the bride in this instance.