Acute necrotizing ulcerative gingivitis (ANUG) or necrotizing ulcerative gingivitis (NUG) is a sub-classification of necrotizing periodontal disease, an infection of the gum tissue. This presents as an acute infection of the gingiva without involvement of the other tissues of the periodontium. If the infection has progressed deeper into the periodontal tissues, it is subclassified as "necrotizing ulcerative periodontitis" (NUP).
The condition is also commonly referred to as "trench mouth" and
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