Overstyling and underconditioning weaken your hair's cuticle, or outer layer, making hair dry, frizzy, dull looking, and vulnerable to more damage. It's time to lose the Brillo-pad effect!
To repair hair:
Start at the roots. Beautiful tresses begin with the scalp, says Ben Skervin, a hairstylist in New York City and London who works with such celebrities as Madonna and Keira Knightley. He recommends using Head & Shoulders Smooth & Silky Shampoo, $4.99, drugstores, even if you're not suffering from dandruff. Most shampoos simply wash away oil and dirt, but Head & Shoulders also nourishes the scalp, which promotes hair growth, and moisturizes strands from root to tip.