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Control low-force gp (CL): The maxillary left 1st molar (M1) was subjected to 10\u201315\u00a0g orthodontic force by nickel titanium coil spring stretched between the M1 and maxillary incisors. Control high-force gp (CH): The M1 had heavier orthodontic force of 50\u00a0g. Laser low-force gp (LL): The M1 had orthodontic force of 10\u201315\u00a0g &amp; PBM using GaAlAs diode laser (\u03bb\u2009=\u2009980\u00a0nm, 100 mW output power) at two points palatal and two buccal, with a continuous non-contact irradiating mode for 12\u00a0s for each point (energy of 1.2\u00a0J\/point, fluence of 16.9\u00a0J\/cm\n                      <jats:sup>2<\/jats:sup>\n                      ). Laser high-force gp (LH): M1 had orthodontic force of 50\u00a0g &amp; PBM. The rats were euthanized after 7- and 21-days intervals in each gp and the maxillae were dissected out, then serial transverse sections of the M1 were taken for histological and histomorphometric evaluation.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Our results showed significant decrease in the amount of OIIRR in the laser gps at day 21 in all force subgroups, without significant change at day 7.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>PBM can significantly reduce the overall amount of root resorption and enhance\/accelerate the healing of OIIRR.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s12903-025-07217-2","type":"journal-article","created":{"date-parts":[[2025,12,11]],"date-time":"2025-12-11T03:06:25Z","timestamp":1765422385000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Effect of photobiomodulation therapy on orthodontic-induced inflammatory root resorption in male albino rats"],"prefix":"10.1186","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6935-3451","authenticated-orcid":false,"given":"Ahmed M.","family":"Yassin","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Afaf A.","family":"El-Sawa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amira A.","family":"Elnozahy","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2885-5305","authenticated-orcid":false,"given":"Hagar S.","family":"Abdel Fattah","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,12,11]]},"reference":[{"key":"7217_CR1","doi-asserted-by":"publisher","first-page":"653","DOI":"10.1089\/pho.2018.4508","volume":"36","author":"N Gul Amuk","year":"2018","unstructured":"Gul Amuk N, Kurt G, Guray E. 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