Cranberry juice will help prevent gum disease. The same anti-bacterial properties that are present in cranberry juice will protect you from any periodontal disease. A part of the juice called nondialysable material prevents bacteria from sticking to your gums. You should limit your intake to no more than one glass (8 ounces) daily. The label should say 100 percent juice. You do not want a “juice drink”. You will find this kind of juice in health-food stores and in some larger supermarkets. There are 140 calories in eight ounces of cranberry juice.