The present invention relates to an apparatus for inhibiting nocturnal drying of the oral cavity from breathing through a person's mouth. More particularly, the invention is directed to an apparatus comprising an air permeable cover, an elastic strap attached to the cover for securing the cover to a...http://www.google.sh/patents/US6148820?utm_source=gb-gplus-sharePatent US6148820 - Apparatus for inhibiting nocturnal drying of the oral cavity
