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Blue black pigmentation of gingiva
# Blue black pigmentation of gingiva is seen with pre existing toxicity of:
A. Bismuth
B. Lead
C. Arsenic
D. Mercury
The correct answer is A. Bismuth
Bismuth pigmentation in the oral cavity usually appears as a narrow, bluish black
discoloration of the gingival margin in areas of preexisting gingival inflammation.
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