@article{meireles_fontes_coimbra_bona_demarco_2012,  title={Effectiveness of different carbamide peroxide concentrations used for tooth bleaching: an in vitro study},  volume={20},  ISSN={1678-7757},  url={https://doi.org/10.1590/S1678-77572012000200011},  DOI={10.1590/S1678-77572012000200011},  number={2},  journal={Journal of Applied Oral Science},  publisher={Faculdade De Odontologia De Bauru - USP},  author={Meireles, Sônia Saeger and Fontes, Silvia Terra and Coimbra, Luiz Antônio Afonso and Bona, Álvaro Della and Demarco, Flávio Fernando},  year={2012},  month={Mar},  pages={186–191} }