Please remember that Dandruff is usually treated and managed than cured. dandruff is basically a symptom associated with increased production of dead cells from scalp super-ceded with the sebum and fungus.
key to keep tha scalp is to use medicated shampoo for twice a week for the first few weeks and weekly once after the dandruff is kept in control.
wash hair with mild shampoo alternative days preferably late in evenings. if you have habit of applying oil, donot do it if you are going outside. the oil will attract dirt and make the condition worse.
Health Tips
keep the scalp clean and wash atleast once in two days. leave the medicated shampoo for atleast sometime before you rinse off. donot use it like a regular shapoo. and its also better the change the medicated shampoo few months of use and replaced with a different combo. talk to your dermatologist