Which Is Cleaner: A Human’s or a Dog’s Mouth?

October 19, 2026

Woman holding her dog

After being out of the house all day, you may be excited about seeing your dog. Their friendly face and wagging tails show how much they missed you, and you might give them a barrage of kisses. However, while they reciprocate with their own licks, you might wonder about a rumor you heard about a dog’s mouth being cleaner than a human’s. Here’s what your Allentown dentist has to say.

So, Are Dogs’ Mouths Cleaner?

You might think that whichever oral cavity holds the most bacteria is the dirtiest, but there’s more to this than just that. For instance, a dog has over 600 different types of germs in their mouth. However, humans also have a similar number, with 615 and counting!

Dental problems can affect you and your furry friend, but certain bacteria may only impact your grin while your companion has their own to worry about. Porphyromonas is a bacterial family that causes gum disease in both species. P. gingivalis affects you, while P. gulae affects your pup.

Is It Safe to Kiss Your Dog?

Since bacteria that cause inflamed gums are found in both your and your dog’s mouths, you might wonder whether you can get gum disease from giving them a kiss. The good news is that you don’t really need to worry about anything. Most of the germs found in your furry friend’s mouth won’t cause issues for you.

Though there are some exceptions. If you give your companion a raw diet, then you may be at risk of salmonella. The same can also be said if they raid litter boxes. But giving them a quick smooch isn’t any less risky than kissing your partner.

How You Can Keep You and Your Dog’s Teeth Healthy

In the end, you should keep your and your companion’s teeth in great shape. For your oral healthcare, you should brush twice and floss once every day. This removes bacteria that cause decay and infection. Having routine visits to your dentist is also crucial to keep your smile pristine.

For your furry friend, it’s always best to follow what the vet has to say. In most cases, they recommend brushing them consistently and having appointments once a year. So, while their mouth isn’t really cleaner than your own, you should take care of both. That way, you both can flaunt a comfortable grin.

About the Practice

Want to protect your teeth and gums? Our team at Bradford Young Family & Cosmetic Dentistry is dedicated to helping patients in Allentown avoid oral health issues with a wide range of treatments. While Dr. Bradford Young and Dr. Reem Horani can’t see your beloved pet, they can keep your smile free from harm with routine checkups and cleanings. If you have any questions, schedule an appointment or call our office at 610-439-1363.