Is a dog's tongue clean?
A dog's tongue is dirty. According to the AKC, dogs have more than 600 types of bacteria in their mouths, compared to 615 different types of bacteria found in human mouths. Most of the bacteria in a dog's mouth is not zoonotic, which means you probably won't get sick from dog kisses.
A commonly held myth is that dogs have cleaner mouths than humans, but both contain more than 600 types of bacteria.
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