It seems my poor attempt at changing the subject has failed :/
Maybe I'll give it another go.
Myth: A dog's mouth is cleaner than a humans, and may even have healing properties.
Fact: A dogs mouth can harbor as much if not more bacteria or other infectious organisms as a human. Due to the differences in diet, however, those bacteria are different and some are not harmful to humans which is part of why this myth came about. There is a reason for the term "dog breath," and it certainly doesn't come from a particularly clean mouth.