How Does This Teeth Stain Remover Works? 1. You scrub the teeth like an eraser pen. To get rid of the plaque close to your gumms, the pointed end is suppose to be for between teeth and the gum line. 2. It doesn't whiten because it's gentle pumice stone it scrapes/sands the tartar off teeth so, it only gives you the natural color of your teeth. Notice The remnants of the eraser will break apart as you use (naturally, cause you're rubbing/scraping it on the surface of your teeth) and little bits of the black eraser gets on your teeth. Be sure not to swallow or lick it off. Rinse with water and spit the eraser particles out.