@thebrainmaze: Don't Wash Your Hair Every Day - Why does your hair become greasy so quickly after washing? Is washing it every day actually helping, or could it be doing the opposite?

Denver :

"I respectfully disagree. I have noticed that many people who rarely wash their hair and let it get greasy tend to experience more hair loss than others, which eventually leads to thinning hair." "Also, the oil on your scalp is basically food and a breeding ground for germs. If you go to sleep without washing your hair, all the dirt you've gathered throughout the day gets transferred onto your pillow, turning it into a buildup of germs and impurities."