{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,18]],"date-time":"2026-01-18T06:23:09Z","timestamp":1768717389895,"version":"3.49.0"},"reference-count":42,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2016,7,2]],"date-time":"2016-07-02T00:00:00Z","timestamp":1467417600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003725","name":"National Research Foundation of Korea","doi-asserted-by":"publisher","award":["NRF-2014R1A1A1003106"],"award-info":[{"award-number":["NRF-2014R1A1A1003106"]}],"id":[{"id":"10.13039\/501100003725","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nutrients"],"abstract":"<jats:p>This study was performed to assess the relationship between the amount of green tea that is consumed and periodontitis. It is based on data obtained from the Korea National Health and Nutrition Examination Survey, conducted between 2008 and 2010. A community periodontal index equal to code 3 was defined as moderate periodontitis, and code 4 was defined as severe periodontitis (n = 16,726). Consumption of green tea less than one cup per day was associated with a decreased prevalence of periodontal disease among Korean adults. The association between the consumption of green tea and periodontal disease was independent of various potential confounding factors, such as age, sex, body mass index, smoking, drinking, exercise, metabolic syndrome, frequency of tooth brushing per day, use of secondary oral products, the number of dental examination per year, diabetes, hypertension, and white blood cell count. Adjusted odds ratio and 95% confidence interval of no consumption was 1.360 (1.156, 1.601) when participants with consumption of two times per week \u2264 x &lt; 7 times per week was considered as a reference. However, consumption of one or more cups per day increased the prevalence of moderate and severe periodontitis. In conclusion, excessive consumption of green tea may be considered as a risk factor for periodontal disease among Korean adults.<\/jats:p>","DOI":"10.3390\/nu8070408","type":"journal-article","created":{"date-parts":[[2016,7,4]],"date-time":"2016-07-04T10:04:21Z","timestamp":1467626661000},"page":"408","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Excessive Consumption of Green Tea as a Risk Factor for Periodontal Disease among Korean Adults"],"prefix":"10.3390","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6096-1263","authenticated-orcid":false,"given":"Kyungdo","family":"Han","sequence":"first","affiliation":[{"name":"Department of Biostatistics, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6493-7412","authenticated-orcid":false,"given":"Eunkyung","family":"Hwang","sequence":"additional","affiliation":[{"name":"Bangmok College of General Education, Myongji University, Seoul 03674, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8915-1555","authenticated-orcid":false,"given":"Jun-Beom","family":"Park","sequence":"additional","affiliation":[{"name":"Department of Periodontics, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2016,7,2]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"165","DOI":"10.1016\/j.jep.2014.05.015","article-title":"Concentrated green tea extract induces severe acute hepatitis in a 63-year-old woman\u2014A case report with pharmaceutical analysis","volume":"155","author":"Pillukat","year":"2014","journal-title":"J. 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