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We searched databases, including PubMed, SID, Magiran, Google Scholar, and Iranmedex using the following keywords in English: H. pylori, tooth decay, oral infection, dental infection, gingival infection and periodontal diseases. Data was analyzed using a meta-analysis and random effect model. Heterogeneity of studies was assessed using the I index, and data was finally analyzed with STATA (Version 11.2).

Relationship between Helicobacter pylori and Periodontal Diseases: A Meta-Analysis Study and Systematic Review