You know what, I'm not exactly surveying people regularly so I could be wrong. Maybe it's from when I was growing up (it's not exactly a common conversation as an adult) that I get that impression.

As for the teeth, I've never noticed it feeling off unless I've missed a whole day, but I've kept to brushing once a day (short of special occasions that you'd want to brush right before something in addition to your regular brushing) so I might not be tuned into that.