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RC samples were taken before (S1) and after (S2) chemo\u2010mechanical canal preparation (CMP), and after intracanal medication (ICM; S3). Checkerboard DNA\u2010DNA hybridization was used for microbial analysis. The levels of LPS and LTA were evaluated using the limulus amebocyte lysate assay and ELISA, respectively. Shapiro\u2013Wilk\u2019s test was used to verify data normality. Friedman\u2019s test was used to evaluate statistical differences using checkerboard DNA\u2010DNA hybridization in the ID and RC at the different phases of the RC treatment. <jats:italic>Post hoc<\/jats:italic> Dunn\u2019s multiple comparison test was used to verify significant differences recorded at the different time\u2010points. The levels of LPS and LTA were analysed statistically by using repeated measures <jats:sc>anova<\/jats:sc> and Tukey\u2019s <jats:italic>post hoc<\/jats:italic> test to evaluate differences in both sites. The significance level was set at 5% (<jats:italic>P<\/jats:italic>\u00a0&lt;\u00a00.05).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>A total of 40 DNA probes were used for microbial investigation of ID and RC samples using checkerboard DNA\u2010DNA hybridization. The levels and complexity of bacteria were similar in the ID and initial RC samples. The levels of LPS and LTA in ID were significantly higher than the initial RC samples (S1; <jats:italic>P<\/jats:italic>\u00a0&lt;\u00a00.05). Canal preparation was effective in significantly decreasing the levels of bacteria, LPS and LTA (<jats:italic>P<\/jats:italic>\u00a0&lt;\u00a00.05). ICM did not provide additional reduction in the levels of bacteria and LPS (<jats:italic>P\u00a0<\/jats:italic>&gt;\u00a00.05). However, a significant reduction in the levels of LTA was observed after ICM (<jats:italic>P<\/jats:italic>\u00a0&lt;\u00a00.05).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The microbial profile of infected dentine and root canals of teeth with irreversible pulpitis was complex, harbouring different species including Gram\u2010positive and Gram\u2010negative, cocci and bacilli, and facultative and strict anaerobes. Root canal preparation was effective in reducing the levels of bacteria, LPS and LTA from the root canals of teeth with pulpitis.<\/jats:p><\/jats:sec>","DOI":"10.1111\/iej.13402","type":"journal-article","created":{"date-parts":[[2020,9,6]],"date-time":"2020-09-06T09:04:33Z","timestamp":1599383073000},"page":"46-60","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":30,"title":["Investigation of microbial profile, levels of endotoxin and lipoteichoic acid in teeth with symptomatic irreversible pulpitis: a clinical study"],"prefix":"10.1111","volume":"54","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0968-0212","authenticated-orcid":false,"given":"R.","family":"Arruda\u2010Vasconcelos","sequence":"first","affiliation":[{"name":"Division of Endodontics Department of Restorative Dentistry Piracicaba Dental School State University of Campinas \u2013 UNICAMP Piracicaba Brazil"},{"name":"Department of Oral Biology Institute of Clinical Sciences The University of Birmingham School of Dentistry Birmingham UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3480-8433","authenticated-orcid":false,"given":"L. 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