Ultrasound best method of cleaning and for gum health. Also, this unite had a infrared light that whitens the teeth. After using this toothbrush for one week I could feel my gums tighten up against my teeth. My teeth were so clean and smooth. I had lost my dental coverage for eight years. I went for my first cleaning recently, and also no tarter at all. The ultrasound light loosens the tarter so you can brush it away. Not all sonic toothbrushes have ultrasound. Very few do, and this is a great price for all of the features.