SCIENCE PHOTO LIBRARY. SCIENCE PHOTO LIBRARY.
Close-up of the mouth of a person showing worn teeth & gums, caused by excessive & heavy brushing. The yellow-black staining around the teeth is from tar, caused by heavy smoking; the excessive brushing may have been an attempt to remove such stains. Brushing (along with gum disease - gingivitis) has eroded the gums; the apparent "sinking" of the gums of the lower jaw reveals the fang portions of the teeth (ie the lower parts, normally below the level of gums).
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