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Necrotising ulcerative gingivitis (NUG) (Figure 4.7 a,b), also known as acute necrotising ulcerative gingivitis (ANUG), trench mouth, or Vincent’s angina, is one of the most unpleasant acute illnesses to affect the oral cavity, and can make a patient feel extremely ill.

Figure 4.5 (a,b) Implementing the 2017 Classification of Periodontal Diseases to Reach a Diagnosis in Clinical Practice.

Source: From [6]. Reproduced with permission of The British Society of Periodontology.

Figure 4.6 25‐year‐old woman; localised periodontitis, stage III (severe), grade‐C, currently unstable, no risk factors.

Source: Professor Nicola West, Bristol University. Reproduced with permission of Professor Nicola West.

Figure 4.7 (a,b) Necrotising ulcerative gingivitis.

Source: [7]. Reproduced with permission of Blackwell.