: a severe form of gingivitis that is marked especially by painful, bleeding gums with ulcers and is associated with the proliferation of microorganisms (such as the bacteria Fusobacterium nucleatum and Treponema vincentii) that are normally part of the oral flora
Signs of alcoholism include the smell of alcohol on the patient's breath, signs of self-neglect of mouth, clinical signs of acute necrotizing ulcerative gingivitis, poor personal hygiene …— Carolyn C. Newman, The Dental Assistant, January 2003
Other symptoms of acute necrotizing ulcerative gingivitis include bad breath, a gray film on the gums, and fever. Risk factors may include poor oral hygiene, tobacco use, pre-existing oral infection, and a weakened immune system (as from poor nutrition or emotional stress).
— called also fusospirochetosis, necrotizing ulcerative gingivitis, trench mouth, Vincent's infection