Acute Necrotizing Ulcerative Gingivitis. An acute, painful condition characterized by severe gingival redness, spontaneous bleeding, foul breath and pain.
Found on http://www.cosmeticdentistryguide.co.uk/glossary.html
(Acute Necrotizing Ulcerative Gingivitis) ANUG is an acronym for Acute Necrotizing Ulcerative Gingivitis more commonly known as trench mouth due to the disorder being common among soldiers during World War 1 or Vincent's disease after the French physician Henri Vincent (1862-1950). Found on http://www.dentalfind.com/info/anug-acute-necrotizing-ulcerative-gingivitis