Healthcare devices that hook up to your smartphone are a big part of CES these days, and the oral care market is certainly in on the trend. Oral-B already announced its latest high-end toothbrush, and Colgate has its own unique take on improving your brushing experience. The Plaqless Pro smart electric toothbrush can, of course, connect to your phone with Bluetooth, but the real trick of note here is a tiny embedded sensor that can detect plaque buildup in your mouth as you brush. That's communicated back to you by a light ring that turns blue when plaque is detected and turns white when the area is clear. Colgate representatives said the sensor is able to detect this on the individual tooth level.