Have you ever heard that a dog's mouth is cleaner than a human mouth? Someone may have said this while their dog was passionately licking your face or eating off of your plate in a well-meaning attempt to make you feel better. Well, sorry: a dog's mouth contains just as much bacteria as your mouth does.
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Key Facts In This Video
Dog mouths are not cleaner than human mouths, as both mouths contain species-specific bacteria. 00:43
One 2015 study found that oral-to-oral transfer of bacteria from dogs to humans can cause gingivitis and periodontal disease. 01:14
You're more likely to catch an infection by swapping saliva with another human than with a dog. 02:37