Fusospirochetal gingivitis, commonly known as trench mouth, is a severe and painful infection that leads to swelling and the shedding of dead tissue from the mouth and throat, originating from infected gums. While it's believed that certain bacteria and spirochetes play a role in this disease, the complete understanding of its causes remains elusive. This ailment is also referred to as Vincent's angina, named after the French doctor Henri Vincent (1862-1950). The term "angina" is derived from the Latin word "angere," meaning "to choke or throttle." Due to its complex nature, this disease is known by various other names such as acute necrotizing ulcerative gingivitis (ANUG), acute membranous gingivitis, fusospirillary gingivitis, fusospirillosis, necrotizing gingivitis, phagedenic gingivitis, ulcerative gingivitis, Vincent's gingivitis, Vincent's infection, and Vincent's stomatitis.