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Vincent's angina, Vincent's infection, trench mouth(noun) an acute communicable infection of the respiratory tract and mouth marked by ulceration of the mucous membrane.
The human mouth normally contains a balance of different bacteria, but trench mouth occurs when this balance is upset. Oral bacteria build up, which damages gum tissue, causing it to become infected and develop ulcers [source: PubMed Health]. Trench mouth is often quite painful. Symptoms can come on suddenly and include [source: Mayo Clinic]: