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A questionnaire form including oral hygiene habits, the severity of Covid-19, the presence, severity and durations of oral manifestations was prepared, and a web-based survey was performed using Google-forms. Obtained data was analysed with Pearson chi-square and Fisher's exact tests with statistical significance set at <jats:italic>P<\/jats:italic>\u2009&lt;\u20090.05.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>The most commonly reported manifestations were taste dysfunction (63.4%), xerostomia (59.9%), halitosis (31.1%), dysphagia (27.8%), hypersensitive teeth (27.2%) and gingival bleeding (14.3%). The incidence of the oral manifestations was found significantly associated with severity of COVID-19 (<jats:italic>P<\/jats:italic>\u2009=\u20090.000\u00a0V\u2009=\u20090.151), presence of systemic diseases (<jats:italic>P<\/jats:italic>\u2009=\u20090.034, V\u2009=\u20090.074) and age (<jats:italic>P<\/jats:italic>\u2009=\u20090.023, V\u2009=\u20090.099). Tooth brushing decreased the incidence of aphthous like lesions of tongue during Covid-19 (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05).<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusion<\/jats:title>\n            <jats:p>Maintenance of oral hygiene was associated with a reduced incidence of aphthous-like lesions, underscoring the protective role of routine oral care. These findings highlight the need to integrate oral health assessment and hygiene education into COVID-19 management protocols, which may also be important for potential future pandemics.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/s12903-025-06075-2","type":"journal-article","created":{"date-parts":[[2025,5,21]],"date-time":"2025-05-21T19:05:50Z","timestamp":1747854350000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Oral hygiene influence on the incidence and severity of oral manifestations in Coronavirus Disease 2019"],"prefix":"10.1186","volume":"25","author":[{"given":"Ba\u015fak","family":"Y\u0131lmaz \u00c7\u0131nar","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Oya","family":"T\u00fcrko\u011flu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sema","family":"Becerik","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2025,5,21]]},"reference":[{"key":"6075_CR1","unstructured":"WHO. 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