@article{costa_dorta_ribeiro-dias_pimenta_2012,  title={Biofilms of black tooth stains: PCR analysis reveals presence of Streptococcus mutans},  volume={23},  ISSN={0103-6440},  url={https://doi.org/10.1590/S0103-64402012000500014},  DOI={10.1590/S0103-64402012000500014},  number={5},  journal={Brazilian Dental Journal},  publisher={Fundação Odontológica de Ribeirão Preto},  author={Costa, Marília Teixeira and Dorta, Miriam Leandro and Ribeiro-Dias, Fátima and Pimenta, Fabiana Cristina},  year={2012},  month={Sep},  pages={555–558} }