When we think about probiotics, we automatically think of intestinal health. We know that intestinal health is a significant key to our healthy immune system, so it is important to maintain its integrity by eating fermented foods or regularly supplementing with probiotics.
But now we can look at the other end of the digestive system- the mouth. Most of us are already aware that the health of the mouth is a reflection of our bodily health. This has already been shown through conventional medicine with simple correlations of periodontal (gum) disease with coronary disease. Holistically, the meridian system (via Acupuncture) has shown that every tooth is correlated with a corresponding body part. (see Meridian Chart here)
With this in mind, maintaining a healthy flora in the oral cavity may be an important shield in preventing cavities, gum disease, bad breath and localized infections like the common cold or sore throat. The bigger picture is that it may save your life by preventing disease in distant outlying bodily organs.