No one knows LeBron James' hair—or more specifically, LeBron James' hairline—better than Nick Castemanos. The 29-year-old Florida native has served as LeBron's personal barber for about a year now, ever since LeBron asked him to pick up and move his life to Cleveland when he rejoined the Cavaliers last summer. So it's safe to say that Castemanos knows how and why LeBron's hairline magically reappeared last year after receding further and further back over the course of the last few seasons.

Recently, Yahoo! Sports caught up with Castemanos to speak about LeBron's hair and to ask what he puts in it to make it look fuller. Castemanos' response? Er, nothing. He maintained that LeBron does not use anything as far as additives are concerned.

"There is no dye," he told Yahoo! Sports. "No additives. No preservatives. Everyone thinks he's dying his hair using [temporary hair colorings] Bigen or Black Ice. It's all his hair. They still don't believe me. I get Bigen comments all the time. I've become numb to it. It used to bother me. It's not easy to hear that."

Castemanos also admitted that LeBron is his "hardest haircut," but he said that the Cavs superstar has good hair, despite what some people might think.

"LeBron is very tedious about how his hair is cut," he told Yahoo! Sports. "The beard is the No. 1 thing. He leaves the top up to me. I leave him less bald. He's my guy…He has good hair. You have to cut right."

Are you buying Castemanos' story, or do you think he's just covering for LeBron? If he has actually found a way to improve the most famous receding hairline in the NBA without any additives as he says, he's one hell of a barber.

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[via Yahoo! Sports]