Christopher Evensen

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Periodontal diseases are bacterial infections that occur at or below the gum line. In contrast to gingivitis, which affects only the gums, periodontitis (severe periodontal disease) may involve the soft tissue and bone supporting the teeth. An estimated 70 percent of the adult U.S. population is affected by these infections. This includes 20–30 percent who(More)
Arthur J. Gold is a professor in the Department of Natural Resources Science at the University of Rhode Island, Kingston, Rhode Island. Doug Parker is the director of the California Institute for Water Resources at the University of California, Oakland, California. Reagan M. Waskom is the director of the Colorado Water Institute/ Water Center at Colorado(More)
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