Dandruff is harmless, so you can treat it at home without a prescription.
Two of the quickest ways to get started are to brush your hair and try a dandruff shampoo.
Brush your hair from your scalp down with steady, firm strokes. This will carry the oil from your scalp, where the buildup of oil and skin cells can cause dandruff, along the hair strands, where it will keep your hair shiny and healthy.