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. 1977 Aug;56(8):895-9.
doi: 10.1177/00220345770560081001.

Investigations into black extrinsic tooth stain

J S Reid, J A Beeley, D G MacDonald

Investigations into black extrinsic tooth stain

J S Reid et al. J Dent Res. 1977 Aug.

Abstract

An investigation has been carried out into the nature of the black pigment in black extrinsic tooth stain. The results suggest that the black material is a ferric salt, probably ferric sulfide, formed by the reaction between hydrogen sulfide produced by bacterial action and iron in the saliva or gingival exudate.

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