An example of acute necrotizing ulcerative gingivitis, also known as trench mouth. Original image sourced from US Government… https://www.rawpixel.com/image/2288464/free-photo-image-teeth-mouth-gingivitisFree Image from public domain licenseFace of a woman with tuberculated ulcerations due to tertiary syphilis https://www.rawpixel.com/image/13971238/face-woman-with-tuberculated-ulcerations-due-tertiary-syphilisFree Image from public domain licenseUlcerated and deeply infiltrated epithelioma of the lip, gum and chin https://www.rawpixel.com/image/13984835/ulcerated-and-deeply-infiltrated-epithelioma-the-lip-gum-and-chinFree Image from public domain license