Men dye their hair for all ... out what you'll look like post-dye job is to have at it yourself. To paraphrase the great Amy Winehouse: Even if you dye a hundred times, you can always go back ...

The medical term for hair graying is canities. Hair turns gray (or white) when your hair follicles stop creating melanin. Melanin is the substance that gives your skin and hair color.

Hair dyes contain chemicals that in rare cases can cause severe, even life-threatening, allergic reactions. Hair dye manufacturers say they are not intended for anyone under the age of 16.