Funny, some years ago there was a thread here about tv show pet peeves or something to that effect, and I was curious as to why I never saw anyone on tv rinse their mouth after they spit out the toothpaste. I asked if this was a real thing that people do, and if I'm the weird one for rinsing with water. I don't believe anybody else on that thread ever said anything about how they also don't rinse, rather that they probably just do it that way on tv because they don't have time for it and have to keep the dialogue moving. So to now hear that this really is a 'thing' is interesting.
I always rinse out the toothpaste (and will continue to do so), but when I use a fluoride rinse, I do not, as it says in the directions not to, and to wait 30 minutes before eating or drinking. I guess logically toothpaste is also a type of fluoride, so it would sort of make sense that it too would need to 'sit' on the teeth for a while, but I never gave it any thought. Does the tooth 'polish' they use when you get your teeth cleaned at the dentist have fluoride in it? Because they rinse that off with water right away too.