[inkcapmushroom]

That's called an ultrasonic scaler, which is quite different to the device in the article. A scaler is for removing tartar and stain while the device in the article is an ultrasound (like the device for viewing babies during pregnancy) which looks under your gums at your tooth roots and bones to see if you have any bone loss or gum disease.

You might not have the dentist or dental hygienist use the probe very often. When they do it's a rounded straight tip device, and they usually call out numbers to an assistant for how deep under the gumline the probe can reach. That's the procedure this device would replace. If nothing else it's an improvement because you don't need an assistant to record the numbers, and if someone has bad gum disease it might hurt them when you poke in there with a probe.