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. 2021 Apr 27;11:9049. doi: 10.1038/s41598-021-87265-0

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© The Author(s) 2021

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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(a) The relative change of pressure pain thresholds (PPT) and NRS pain scores (mean and standard error) in masseter myalgia patients during the experiment (n = 50). Photobiomodulation (PBM) group (n = 25); Placebo group (n = 25). “*” indicates significant difference between D1-pre and other time points (P < 0.05). (b) The relative change of pressure pain thresholds (PPT) and NRS pain scores (mean and standard error) in TMJ arthralgia patients during the experiment (n = 50). Photobiomodulation (PBM) group (n = 25); Placebo group (n = 25). “*” indicates significant difference between D1-pre and other time points (P < 0.05); “#” indicates significant difference between PBM and placebo (P < 0.05).