Table 1. Meta-analysis of periodontal disease and oral H. pylori associated with stomach H. pylori infection published during 2011–2016.

Author	Year	Number	Conclusion
Ren et al.15	2016	691 participants	Periodontal therapy increased eradication rate of stomach infection
Sayed et al.16	2014	4959 participants. Articles published during 1990–2012	Oral H. pylori increased stomach re-infection
Adler et al.13	2014	>5000 participants 48 articles and 12 clinical trials	Close relation oral H. pylori and stomach H. pylori infection
Marbaix et al.14	2013	> 5000 participants Included 48 articles	Close relation oral H. pylori and stomach H. pylori infection
Navabi et al.17	2011	1861 participants	Close relation oral H. pylori and stomach H. pylori infection
Zou and Li71	2011	>6000 participants Articles published during 2010–2011	Close relation oral H. pylori and stomach H. pylori infection