Nothing has been proven, not even the manufacturers of such brushes hold a traceable test ready. So I can only rely on my own test and shown to be negative. I made a Miradent tablet (from the pharmacy, the bacteria on the teeth visible. Red (new Plack) blue (old Plack). Then I (ie only ultrasound) lightly brushed mechanically without movement of the brush head. The red and blue Plack was still full to see. Then I cleaned with 8000 movements. Red Plack on the tooth surfaces was away (which can of course any other moving toothbrush also). But the red Plack between the teeth was still full to see. The blue was anyway still there. I also have a 4 day test without flossing made and normally cleaned with 18,000 movements. Unfortunately, the spaces of day to day went on. On 5 day I freed them with dental floss again. Either my toothbrush is defective, or it is real Quark. Simply make the test with the Miradent tablet and they will make their own experience. I hope not and will pick up the Emmi-dent and then reports. By the way: if you are 2 or 3 days do not brush your teeth you have with which you can test enough red pack.
How these butts (I liked) fits? have no idea. At Amazon, I see nothing.
