I wanted to share with you my favorite dry shampoo (pictured below). I like this dry shampoo, because its super inexpensive and it works really well.
I only apply the dry shampoo to my straight hair when its feeling super oily, or if my scalp is getting dry.
To apply, I just shake the bottle and spray the shampoo on my scalp and then massage. I do that to my whole head, and when I am finished I just run the brush through.
I only use the dry shampoo about twice while my hair is straight, normally after my hair has been straight for about three weeks.