The most important thing you can do to prevent or resolve oily hair is to shampoo your hair daily. For people who tend to have a problem with oily hair, leaving the shampoo on your head for at least 5 minutes before rinsing may help.Avoid brushing your hair too often or too vigorously, since the brushing will carry oil from your scalp to the ends of your hair.
Hormones affect oil production and therefore things that affect your hormone levels (such as stress or birth control pills) may also affect the oiliness of your hair. Link...
