1. 1. Throughout this paper, we use the term "oral health" to refer to the health of all aspects of the mouth and related cran-iofacial structures-including the teeth, gums and supporting tissues, hard and soft palate, mucosal lining of the mouth and throat, tongue, lips, salivary glands, chewing muscles, and upper and lower jaws. Thus, oral health en compasses more than just healthy teeth.