From a Dermatologist
When it comes to your scalp health, dermatologist Francesca Fusco, MD, said there is no "golden rule" for the amount of times you should wash your hair a week. "If a person is oily, it's fine to wash it every day. If they are dry, it's fine to wash it once a week, but once a week at least for hygienic purposes. Individuals with dandruff should shampoo at least twice a week using an antidandruff shampoo."