Most Helpful Girl
If you wash it every day, your hair has to produce more of the natural oils that your hair needs to be healthy. Washing it every day basically makes it have to work overtime. Yes, overwashing your hair can make it get GREASIER FASTER.
You really only need to fully wash and condition your hair no more than 2-4 times a week. In between washes, use dry shampoo to absorb extra oil and take away any "two day old" scent.
Note, you can still shower every day, but it isn't necessary to wash your hair every single time.