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Information on the utilization of dental services and oral health parameters (DMFT index, degree of restoration, Periodontal Screening Index, Bleeding on Probing, Oral Hygiene Index, Denture Hygiene Index) were collected.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>An increase in dementia resulted in significant reduction in utilization. Moreover, with increasing cognitive impairment\/dementia there was a significant difference in the number of teeth that were decayed, but not in the number of filled or missing teeth or the DMF\/T index itself. With increasing dementia, the degree of restoration decreased and oral\/denture hygiene deteriorated significantly. Nevertheless, periodontal therapy was required for all subjects independent of their degree of dementia while bleeding on probing was increasing with increasing dementia.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>An influence of cognitive impairment and dementia on oral health and on the utilization of dental services was shown. However, no conclusions about the influence of the utilization behavior of people with dementia on oral health parameters can be drawn. Further longitudinal studies are needed.<\/jats:p><jats:p><jats:italic>Trial registration<\/jats:italic>ClinicalTrials.gov NCT03775772. Registered 14th December 2018,<jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" xlink:href=\"https:\/\/clinicaltrials.gov\/ct2\/show\/NCT03775772\">https:\/\/clinicaltrials.gov\/ct2\/show\/NCT03775772<\/jats:ext-link>.<\/jats:p><\/jats:sec>","DOI":"10.1186\/s12903-021-01753-3","type":"journal-article","created":{"date-parts":[[2021,8,14]],"date-time":"2021-08-14T09:02:42Z","timestamp":1628931762000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":33,"title":["Influence of cognitive impairment and dementia on oral health and the utilization of dental services"],"prefix":"10.1186","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8293-9297","authenticated-orcid":false,"given":"Julia","family":"Jockusch","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Werner","family":"Hopfenm\u00fcller","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7262-3838","authenticated-orcid":false,"given":"Ina","family":"Nitschke","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,8,14]]},"reference":[{"issue":"5","key":"1753_CR1","doi-asserted-by":"publisher","first-page":"630","DOI":"10.1002\/j.0022-0337.2013.77.5.tb05513.x","volume":"77","author":"I Nitschke","year":"2013","unstructured":"Nitschke I, Kunze J, Reiber T, Sobotta BA. 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