Images of patients demonstrating the clinical progression of periodontal disease from gingivitis to advanced periodontitis.

(A) If not treated, mild gingivitis leads to (B) severe gingival inflammation and (C) periodontitis characterized by separation of gingival tissue from the tooth, followed by (D) severe periodontitis, which eventually results in loss of teeth. Images taken are of patients attending the Oral Medicine Clinic at the University of Maryland School of Dentistry.