Web-Enabled Toothbrushes Join the Internet of Things

What the world needs now is a Web-enabled toothbrush. That part is clear to several oral-hygiene companies. What they can't agree on is who was first to put teeth into the smartphone. This race to wire the world's jaws is playing out in one of tech's buzziest arenas: the so-called Internet of things. Giants like Google, which recently bought a networked-thermostat maker called Nest, are investing, as are smaller startups. New products include smart socks (to measure running form) and connected water bottles (to gather water-consumption data.)