We know your dirty little secret.  The American Dental Association recommends brushing your teeth twice daily, but only about 70% of Americans actually do — and even then, most people bail long before the full two minutes are up. Now imagine cutting that routine down to just 20 seconds — and getting screened for more than 300 health conditions at the same time. The Y-Brush Halo claims to do just that. French toothbrush maker Y-Brush unveiled the latest version of the device last month at the