It's no secret that running can be great for the mind, body and soul. Who doesn't love that rush of endorphins and that sense of accomplishment after a great run?

But runners beware, what it's doing to our teeth may surprise you.

According to the Scandinavian Journal of Medicine & Science in Sports, a new study is linking an increase in cavities and tooth erosion among runners and athletes who train for long periods of time, multiple days a week.

"Expending that much energy requires an increase in carb and sugary food intake like sports drinks and protein bars," explained Dr. Jessica Emery, cosmetic dentist and owner of Sugar Fix Dental Loft Chicago.

So were does the decay come in? "Sugar feeds the decay causing bacteria. Our defenses against this bad bacteria live in our saliva," the expert told us.

"Because of this sugary food, the dry mouth that comes with the way we breathe during our exercise and the dehydration that comes with sweating for long periods of time, these make a perfect trifecta for cavities."

But don't throw away your sneakers just yet. Here are some tips from Dr. Emery on how to keep your mouth as fit as your body.

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