Final answer:
Trench mouth, also known as acute necrotizing ulcerative gingivitis (ANUG), is a severe form of gingivitis caused by a mixed bacterial spirochetal infection of the gingival edge.
Step-by-step explanation:
Trench mouth, also known as acute necrotizing ulcerative gingivitis (ANUG), is a severe form of gingivitis caused by a mixed bacterial spirochetal infection of the gingival edge. It is characterized by erosion of the gums, ulcers, pain with chewing, and halitosis. The bacteria involved in trench mouth include Prevotella intermedia, Fusobacterium species, and Treponema vicentii.