For our professional cleanings, we use ultrasonic instruments rather than the traditional hand instruments.  There are many benefits to doing this.  The ultrasonic cleaning tip has a special shape that allows for close adaptation to all the tooth surfaces.  You can't clean what you can't reach.  The cleaning tip is electrically powered and the vibration strength can be set higher for heavy stains or lower for sensitive teeth.  Stain and bacteria are removed by a combination of the tip's vibration and the water spray that hits the tip.  The water is suctioned away by the dental assistant.  After ultrasonically cleaning 360 degrees around each tooth, we finish by polishing all the teeth  and then doing interdental cleaning with dental floss and "soft picks".