PITHON, M.M., LACERDA-SANTOS, R., BARRETO, J.R., ROCHA, J.O., BRASIL, R.V.G., WEBERLING, L.B., PAIXÃO, J.V.B. and COQUEIRO, R. da S., 2015. Black spaces between maxillary incisors: what is the aesthetic limit? . Bioscience Journal [online], vol. 31, no. 5, pp. 1586–1593. [Accessed25 June 2022]. DOI 10.14393/BJ-v31n5a2015-29092. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/29092.