DefinitionBy Mayo Clinic staff
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Trench mouth is a severe form of gingivitis that causes painful, infected, bleeding gums and ulcerations. Although trench mouth is rare today in developed nations, it's common in developing countries that have poor nutrition and poor living conditions.
Trench mouth, also known as necrotizing ulcerative gingivitis (NUG), earned its nickname because of its prevalence among soldiers who were stuck in the trenches during World War I without the means to properly take care of their teeth. Trench mouth is not contagious.
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