Improving the health of a person s mouth is a well known benefit of mint. Since it has germicidal qualities and quickly freshens breath, it adds to oral health by inhibiting harmful bacterial growth inside the mouth and by cleaning the tongue and teeth. This is why mint used to be rubbed directly on the teeth and gums to refresh the mouth and eliminate dangerous forms of growth. In modern times, for the same reason, mint is one of the most common elements in toothpastes, mouthwashes, and other dental hygiene products. Of course, the easiest way to get these results is to simply chew on the leaves.