Merck Manual

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Acute Necrotizing Ulcerative Gingivitis
Trench Mouth
Acute Necrotizing Ulcerative Gingivitis

Acute necrotizing ulcerative gingivitis (ANUG) is characterized by painful gums that bleed easily, the erosion and death of gum tissue between the teeth, and foul-smelling breath. In this photo, gum tissue is fiery red. Best seen along the lower front gumline, there is also a thin line of gray, dead tissue (pseudomembrane) that bleeds easily.

Image courtesy of Craig Fowler, DDS