noun
a severe form of gingivitis characterized by painful ulcers and necrosis of the gums and jaw
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Trench mouth, also known as acute necrotizing ulcerative gingivitis, is a severe gum infection caused by bacteria.
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My dentist warned me about trench mouth after I neglected my oral hygiene for too long.
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I heard that not brushing your teeth can lead to trench mouth, that's gross!
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Neglecting to take care of your responsibilities can result in a metaphorical trench mouth of problems piling up.