So you’ve gotten rid of your two-in-one shampoo and conditioner; but now, you have no idea how often you’re supposed to use those fancy new shampoo and conditioner bottles sitting in your shower.

Carley Millhone is a writer and editor based in the Midwest who covers health, women's wellness, and travel. Her work has appeared in publications like SELF, Greatist, and PureWow. It's a common ...