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. 2022 May 19;12:8498. doi: 10.1038/s41598-022-12498-6

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© The Author(s) 2022

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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Standard image and QLF image of a representative sample in group II (Bifluorid 12, sample #12) at different investigation times. The dashed line indicates the ground surface where the QLF measurements were performed. (a) Prior to demineralisation. (b) Corresponding QLF-image: ΔF = 0.0%; ΔFmax = 0.0%. (c) After demineralisation (T-demin). (d) Corresponding QLF-image (T-demin): ΔF = − 11.3%; ΔFmax = − 20.9%. (e) QLF image T07: ΔF = − 17.7%; ΔFmax = − 36.7%. (f) QLF image T14: ΔF = − 17.1%; ΔFmax = − 36.2%. (g) QLF image T21: ΔF = − 13.3%; ΔFmax = − 30.1%. (h) 28 days after demineralisation (T28). (2i) Corresponding QLF-image (T28): ΔF = − 15.7%; ΔFmax = − 34.2%.