Dandruff is annoying: both the itchiness and flaking. When my dandruff flares, it is hard to wear a black shirt for fear of conspicuous white flakes on my shoulders. Dandruff is caused by the overproduction of scalp cells, which in turn leads to excess shedding of dead cells. Stress, weather, and even yeast called malassezia have been linked to dandruff. Treatment regimens usually begin with a good dandruff shampoo. Neutrogena T/Gel or T/Sal are classic starter therapies. T/Gel contains an exclusive ingredient called Neutar that combats all major scalp issues and T/Sal contains salicylic acid, which aids the breakdown of scalp build-up. Another option is Nizoral A-D shampoo, which contains ketoconazole to eliminate yeast. 

Whenever using a dandruff shampoo, leave it on for several minutes before rinsing. To avoid drying out the hair shaft, apply the shampoo only to scalp and use it only twice a week. Once your dandruff is under control, it is a good idea to use the dandruff shampoo once or twice a month as maintenance to help prevent recurrence.