I had this issue for a long time. To initially get rid of the dandruff, mix a spray bottle of warm water and LITTLE bit of white vinegar. Don't worry, the smell will subside. Spray this mixture on your scalp and let it sit for about 5 minutes. Thoroughly wash and rinse your hair. I had to repeat this treatment before every wash until the problem subsided.

To get rid of itchy scalp and dandruff on a long term basis, you MUST keep your scalp clean. For me, this meant going from washing my hair once a week to washing it every other day. If you use shampoo to clean your scalp, make sure it is gentle.

Also, try not to get your styling products on your scalp. This can clog your pores. Remember, it is always a good idea to ask a medical professional about these matters.