It uses ultrasonic waves to melt the tartare off your teeth and is safe to use. It’s not strong enough to melt enamel, only to melt tartare (even hard plaque melts with some patience). Just follow instructions or watch a YT video explaining how to use it. It’s really not hard. People also use these for pets, as pets are notorious for not being able to stand still very long, but they still need dental care. Just check on Amazon, there’s plenty with thousands of reviews. I got mine on Amazon a year ago or so.