Green tea comes in both caffeinated and decaffeinated forms

Oral cancer rates in China are half that of North America
In China, oral cancer rates are 1/2 that of North America, even though smoking rates - a known risk factor for oral cancer are 3 times higher in China. Each year, more than 30,000 people will be diagnosed with oral cancer, resulting in an estimated 7,800 deaths.
The mouth's oxygen-rich environment connects to several blood vessels which provide a perfect habitat to house oral cancer cells, and in turn allows the cancerous cells to multiply quickly. Ingesting or swishing with green tea introduces the tea's polyphenols to the oral cancer cells lining the mouth. For patients, in order to reap green tea's anticancer benefits, the mouth's mucous lining must be exposed to 4 to 6 cups of green tea a day.