@article{demarco_meireles_masotti_2009,  title={Over-the-counter whitening agents: a concise review},  volume={23},  ISSN={1806-8324},  url={https://doi.org/10.1590/S1806-83242009000500010},  DOI={10.1590/S1806-83242009000500010},  journal={Brazilian Oral Research},  publisher={Sociedade Brasileira de Pesquisa Odontológica - SBPqO},  author={Demarco, Flávio Fernando and Meireles, Sônia Saeger and Masotti, Alexandre Severo},  year={2009},  month={Jun},  pages={64–70} }