Everyone wants leading lady hair. You know, gleaming, glowing hair that seems to be bathed in its own spotlight. Sadly, because of daily wear and tear and overuse of styling products, most of us have dull tresses. It’s easy to turn lifeless locks around, though. Lustrous hair depends on four factors: smoothness, cleanliness, shine-enhancing products, and alignment -- i.e., the cuticle (or protective outer layer of hair) lying flat, so the light can easily reflect off the surface. Here’s how to get your own spotlight-worthy sheen.