This article was first published in the September 2015 issue of WIRED magazine. Be the first to read WIRED's articles in print before they're posted online, and get your hands on loads of additional ...

Does your toothpaste dribble from your mouth? Does it park quietly on your toothbrush? Does it feel gritty on your teeth? There is strong science in making toothpaste. Toothpaste is a solid, but an ...