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. 2021 Aug 3;78(9):3541–3549. doi: 10.1007/s00284-021-02569-8

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© The Author(s) 2021

Open AccessThis 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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Fig. 1 — a Measurement of Bifidobacterium populations on the oral mucosal surfaces. V viable probiotic tablets; H heat-killed inactivated probiotic tablets; C placebo tablets (control); and LAB lactic acid bacteria. Collection and analysis of salivary samples at Weeks 0, 2, 4, and 6 were performed. Data were presented as the mean ± standard deviation (SD). Two-tailed t-test was used to analyzed statistical difference. Statistical significances were marked with *P < 0.05, **P < 0.01, ***P < 0.001. b Measurement of Lactobacillus populations on the oral mucosal surfaces. V viable probiotic tablets; H heat-killed inactivated probiotic tablets; C placebo tablets (control); and LAB lactic acid bacteria. Collection and analysis of salivary samples at Weeks 0, 2, 4, and 6 were performed. Data were presented as the mean ± standard deviation (SD). Two-tailed t-test was used to analyzed statistical difference. Statistical significances were marked with *P < 0.05, **P < 0.01, ***P < 0.001