PAUL KAMEN, DDS: Cavities are actually a demineralization of the tooth surface. They're caused by plaque, the bacteria of the plaque, which if you eat sweet foods the bacteria create acids. The acids actually leach out the enamel of the tooth structure and begin to invade the tooth causing destruction of some of the softer parts of the tooth and eventually decay of the tooth.
DAVID FOLK THOMAS: Graz, where do most cavities form?
GRAZIANO GIGLIO, DDS: Most of them form inside pits and fissures on top of teeth. The nooks and crannies of the tooth. There are other types of cavities that occur between teeth. We can prevent those by flossing. The contact point between one tooth and the other.
DAVID FOLK THOMAS: So it's like partially in one and partially in another.
GRAZIANO GIGLIO, DDS: It actually is caused by getting a piece of food stuck there and the food is there for a long period of time. Plaque accumulates around it. The bacteria make acid which then demineralizes -- most likely -- both teeth. So you're not just getting one. When a dentist tells you get a cavity between the teeth, it's not usually on one tooth. It's on the adjacent tooth also which is awful.
DAVID FOLK THOMAS: Paul, very briefly because we're going to be assuming the worst that people already have a cavity out there. Very briefly on prevention. How can you prevent cavities? What's the best way to do that?
PAUL KAMEN, DDS: The best way of preventing cavities are the old fashioned words to brush and floss every day.
DAVID FOLK THOMAS: Once a day? Twice a day?