I'm always paranoid that I have something in my teeth, or that my makeup has run down my face or that my hair is having a "There's Something About Mary" moment. I can never find a mirror when I need one, and would prefer to discreetly check for potential flaws. So I turn to technology to help and just use the camera on my smartphone!
All you have to do is touch the icon that has a picture of a camera with a circular arrow underneath (looks different on every phone, but most have it). Voila! You now have a digital mirror focused on you and can check your appearance on the sly.