About 50% of adults in the U.S. get dandruff at some time. It's a common scalp problem that can be treated at home. Dandruff causes white or grey flakes, itchiness, dryness, and redness on the scalp. It can even lead to hair loss and thinning. Understanding what causes dandruff is key. It can be due to dry skin, seborrheic dermatitis, too much o