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Addy, M., Moran, J. Extrinsic tooth discoloration by metals and chlorhexidine. II. Clinical staining produced by chlorhexidine, iron and tea. Br Dent J 159, 331–334 (1985). https://doi.org/10.1038/sj.bdj.4805722
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DOI: https://doi.org/10.1038/sj.bdj.4805722