There’s nothing worse than watching your fresh, bouncy blowout fall flat into a limp, greasy mess right before your eyes. It actually pains us to see all that hard work—even if it did come from a stylist—go to waste. Although it’s impossible to completely prevent oil production on your scalp (oh, we’ve tried!), there are a few things that can make it feel dirtier faster. Ahead, six totally surprising reasons your hair feels greasy more quickly than usual. Trust us, not even we expected all of these.