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. 2019 Nov 12;9:16611. doi: 10.1038/s41598-019-52998-6

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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SEM images of biofilm and biofilms after treatment with a different formulation of cinnamon EO. The EO concentrations equal with the MIC/2. (A,B) Control Streptococcus mutans biofilm, untreated. (C) Biofilm treated with PnE of peppermint EO. (D) Biofilm treated with PnE of clove EO. (E) Biofilm treated with PnE of thyme EO. (F) Biofilm treated with HS stabilised PnE of cinnamon EO. (G) Biofilm treated with 20ET stabilised PnE of cinnamon EO. (H) Biofilm treated with 40ET stabilised PnE of cinnamon EO. The magnification is 1500x and 3000x for biofilm control, and 3000x for other samples, scale bar is 8 µm.