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One group stored in artificial saliva served as the negative control (no bleaching). HP concentration at both storage intervals was determined by titration, pH using a digital pH meter, and viscosity by rheometer. BE (\u0394E\n                      <jats:sub>ab<\/jats:sub>\n                      , \u0394E\n                      <jats:sub>00<\/jats:sub>\n                      and \u0394WI\n                      <jats:sub>D<\/jats:sub>\n                      ) was measured with a digital spectrophotometer, and HP penetration (\u00b5g\/mL) by UV\u2013Vis spectrophotometry. Data were analyzed using ANOVA, Tukey\u2019s, and Dunnett\u2019s (\u03b1\u2009=\u20090.05).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      HP concentration and pH differed among brands and decreased after storage for most gels. All gels produced significantly greater BE than the control (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.05\n                      <jats:italic>)<\/jats:italic>\n                      . Storage time had minimal influence on BE. HP diffusion was material-dependent; Viscosity varied among brands, although most gels demonstrated shear-thinning behavior and storage-related changes.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Gels showed material-dependent differences in properties, BE, and PH penetration, with minimal 72-hour storage effects on color. However, storage altered HP concentration, pH, and viscosity in some materials.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Clinical Relevance<\/jats:title>\n                    <jats:p>Evaluating gels after 72 h may supports safe reuse, maintaining efficacy while reducing material waste.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00784-026-07083-4","type":"journal-article","created":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T07:42:24Z","timestamp":1787038944000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Do bleaching gels supplied in attachable syringes maintain their bleaching efficacy 72 hours after mixing?"],"prefix":"10.1007","volume":"30","author":[{"given":"Gabrielle Gomes","family":"Centenaro","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Deisy Cristina Ferreira","family":"Cordeiro","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laryssa Mylenna Madruga","family":"Barbosa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael Willian","family":"Favoreto","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tobia Gaston","family":"Navarro","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fernanda Vieira","family":"Garrido","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9880-4856","authenticated-orcid":false,"given":"Alessandro D.","family":"Loguercio","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,8,18]]},"reference":[{"key":"7083_CR1","doi-asserted-by":"publisher","first-page":"103564","DOI":"10.1016\/j.jdent.2020.103564","volume":"105","author":"ML Goettems","year":"2021","unstructured":"Goettems ML, Fernandez MDS, Donassollo TA, Henn Donassollo S, Demarco FF (2021) Impact of tooth bleaching on oral health-related quality of life in adults: a triple-blind randomised clinical trial. 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