If you let your dog lick your mouth, you’ll probably both swap plenty of nastiness, like bacteria and even parasites. But there is one particular parasite you won’t have to worry about swapping, because there’s a good chance you both share it. A team of researchers recently found there’s a parasite usually found in human mouths that one in six dogs may carry, too.

According to a study published in Veterinary Research Communications by scientists at Wrocław University of Environmental and Life Sciences in Poland, our beloved doggies are harboring Trichomonas tenax . This microscopic parasite hangs out between your gums and teeth, feeding on scraps and occasionally causing gross periodontal infections.

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Researchers swabbed 238 house pets and discovered these oral squatters in 17 percent of dogs and nearly 6 percent of cats.…