Berries are a delicious treat, and one that we don’t have to feel guilty about eating. In fact, studies now show that eating blackberries may play a role in preventing and treating gum disease. It has been previously shown that natural blackberry extract is also associated with blocking the spread of cancer cells. Blackberries have higher antioxidant capacity than blueberries, raspberry, red currant and strawberries. But don’t toss the other berries out the window; strawberries and green vegetables have also been shown to reduce the chance of oral cancer.