Can a dog's mouth be cleaner than a human's mouth?

The notion that a dog's mouth is cleaner than a human's mouth is a common myth. The fact is, dogs and humans have very different bacterial compositions in their mouths, and comparing them is not straightforward.

Dogs' mouths contain many different strains of bacteria, some of which can cause illness, such as salmonella and E. coli. Dogs are also known to lick and eat things that humans would never consider putting in their mouths, such as feces and garbage. These behaviors can increase the likelihood of harmful bacteria and other pathogens being present in a dog's mouth.

On the other hand, humans' mouths contain a wide variety of bacteria, some of which are beneficial for oral health, while others can cause decay and disease. Proper oral hygiene practices, such as brushing and flossing, can help control the growth of harmful bacteria in the mouth.

In conclusion, while a dog's mouth may not necessarily be dirtier than a human's, it's important to take proper precautions when interacting with dogs, including washing your hands and avoiding letting them lick your face or open wounds.