Introduction: Acute Necrotizing Ulcerative Gingivitis

Acute Necrotizing Ulcerative Gingivitis is also known as Vincent's infection, or Trench Mouth. It is a reasonably common inflammatory condition of the gingivae and results in a necrotic, ulcerative destruction of the free gingiva, gingival crest and interdental papillae. It tends to be painful, and the lesions are covered by a grayish membrane that is easily removed with a gentle scraping action to reveal a raw, bleeding surface. It may be accompanied by reports of a metallic taste, and is often associated with a characteristic foul mouth odour.

It seems to have a complex aetiology, but is known to be associated with anaerobic microorganisms including fusiforms and spirochaetes. An underlying gingival or periodontal problem is often present.