Hairstyling Tip of the Day: Tease Your Grease! Tired of greasy or oily roots on day 2 of a shampoo & blow dry? Feel like you can’t skip a day between washes? You can! You just have to bump up your style a little bit. To disguise those greasy roots, all you need is hair spray and a great teasing brush like this one by Diane! The thing that makes the appearances of grease stand out is how flat it lays on your scalp — teasing a little prevents that flat and oily look!