According to a recent study it is possible that dogs and humans can share harmful bacteria through their mouths. “Archives of Oral Biology” claims that bacteria exchange through kissing might lead to gum health issues as well as teeth damage. Researchers who have cooperated with dog owners in Japan have found many types of harmful bacteria in both dogs’ and humans’ mouths and mainly in only one of the two. Of course more researches should be carried out in order to verify these claims. Studies that had been carried out earlier have shown that bacteria exchange between humans can happen after the use of the same toothbrush, pacifier and dental floss. This is why it might seem odd how this bacteria exchange from our dogs and vice versa can happen with a kiss, especially since most of us believe that our dog’s mouth is clean. Those studies have shown that increased percentage in bacteria didn’t have only those who kiss or share their ice cream with their dog, almost the same percentage in bacteria had owners who don’t have such close contact with their dogs. Researchers claim that it is bidirectional, just like bacteria are transferred to us from our dog, the same happens from us to our dog.