Yogurt has been touted for boosting your immune system, but there's another reason it may keep you smiling.

A study in the Journal of Periodontology found that people who consumed 2 ounces or more of lactic acid-rich foods, such as yogurt and kefir, had a 60 percent lower risk for severe periodontal disease than those who didn't eat any. Left untreated, the dental condition can cause bleeding, receding gums, and tooth loss. Scientists once believed it was the calcium in dairy products that fostered oral health, but now they say the effect may be attributed to probiotics, beneficial bacteria found in foods with lactic acid. Since dairy products made without probiotics, like milk and some cheeses, don't provide the same protective effect, get at least half of your dairy servings each day from yogurt.

I found this very interesting because my gum line is receding in some areas (mostly because I brush too hard) and it's causing my teeth to be very sensitive. I usually only eat one serving of yogurt a day, if that, and I really need to boost my intake because of all the previous benefits I've mentioned before, and because, come to find out, it may help my teeth too!