All of a sudden my hair roots are greasy?

Shampoo from the top down every other day. Only repeat if it doesn't lather the first time. Condition once or twice a week from the bottom up. Then, once a week to every other week, take a raw egg, mix it up, and put it in your hair. Rinse it with cold water and brush your hair straight. This should add life and color that your hair didn't know it had. It seems gross at first but trust me, it works AMAZINGLY! Also, if you use an Olive Oil shampoo and conditioner, it works really well on buildup that can make it weird. Other products (mouse, gel, etc.) can also make it greasy.