I've seen that here in Seattle. Nothing new. Probably makes brushing your back teeth a lot easier. I've seen weirder things. Like I saw this one guy who put a valve in his penis that let him control what could/could not come out, and which direction he would piss (forwards like normal, or downwards out of a hole halfway across his penis.) I heard he did it without anesthesia but I don't know if I believe that.