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. 2023 Nov 10;13:19617. doi: 10.1038/s41598-023-46759-9

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© The Author(s) 2023

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Scanning electron micrographs of acid-etched native enamel surfaces after 120 s incubation to HCl at pH = 2.3, (a) bovine enamel, (b) equine enamel, (c) primary enamel, (d) enamel of permanent teeth. The enamel crystallites are exposed in all species by the acid action. No structural differences were observed between the etched enamel samples of all species. Original magnification: 10,000-fold.