No, I still don't get it - are you saying there are bacteria in my mouth (I know there are) that are dangerous, but safe as long as I don't "dislodge" them to another area?
I'm not sure they would sit on the tool very long, don't bacteria need specific conditions to live - hence we freeze/heat/cool things etc to get rid of them? A metal implement sitting in a drawer surely wouldn't let them stay alive for long - not to mention people probably do wash them.
So, anyway, these bacteria in one section of my mouth that are a problem if moved to another part - what do they do that is a problem?
I have no idea because, as I said, I don't get stains or plaque, I've never been to a hygenist and only go to the dentist once every few years, didn't go for ten years one time, no treatment when I did go. I'm not looking to buy one of these, I've never felt the need to scrape at my teeth at all.
Fully agree you have to sterilise between people, of course, that's different.