 And if your teeth are stained from coffee, tea, or smoking, all it takes is five minutes with Paraswabs. In five minutes, you'll see an average of two shades whiter teeth, and in seven days, six shades. It's clinically proven to whiten natural teeth as well as caps and veneers. The secret is a tooth detergent that was developed by Dr. Martin Guiniger that lifts stains off of your teeth. Best of all, there's no messy strips or trays that you have to leave in your mouth for an hour.