Drinking more cups appears to confer additional protection, with five or more cups a day associated with a 23 per cent reduction in risk, according to findings from the Ohsaki Cohort 2006 Study published in Preventive Medicine.
Being an observational study, the findings do not prove causality, but the link
does appear to be biologically plausible, state the authors, led by Yasushi Koyama from Tohoku University Graduate School of Medicine. Previous studies have reported that green tea catechins may inhibit the action of oral bacteria linked to development of periodontal disease, they said.
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