You can save a lot of time by transferring your getting ready duties from home to the subway. It's not like you're going to do anything but sit there anyway. Might as well make use of the time. We saw that woman do makeup with a butter knife earlier, and that seemed like a good idea, so why wouldn't getting ready in other ways be just as useful? I can name one. Brushing your teeth. That's because whenever you brush your teeth, you usually have to spit afterward. How are you supposed to do that on the train?
This lady must be doing a dry brush, but I don't see how that helps your breath. All you're doing is moving all the smelly germs around in your mouth. Your canines start smelling like your molars. That's about it.