Green tea and Dementia
The Ohsaki Cohort Study (54) evaluated a population of over 13,000 Chinese adults. The risk of dementia was found to be 24% lower for those that consumed 5 cups of green tea or more compared to those who drank less than 1 cup.
Green Tea and Oral Health
Sarin, S. et al found that 2% green tea mouthwash rinsed for 1 minute twice daily was statistically significant in the reduction of both plaque and gingivitis after 28 days compared to placebo (52).
A population study by Kushiyama M. et al used a questionaire to evaluate green tea consumption of 940 Japanese men 49 to 59 years old. Researchers found that a lower degree of periodontal disease was associated with an increasing number of cups of green tea consumption (53).