DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Severe gingivitis. Close-up of the mouth of a 86-year-old woman with gingivitis (gum disease), showing ulcers (white, centre right) and blood (lower centre) from bleeding gums. Gingivitis arises from an accumulation of plaque, a sticky deposit of bacteria, mucus and food. The bacteria in the plaque irritate the gums, leading to tissue damage and tooth loss.
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