I use this once or twice a week. I live it in for ATLEAST 30 minutes (usually recommended for overnight) then I wash my hair.
HoliRoots™ Hair Oil
As a dandruff girly (not cute btw), I am not exaggerating when I say that when I used this twice a week, I stopped having dandruff! It was already effective after my first use. Now, I rarely use it— maybe once in three weeks.