Food for teeth?

I'm not sure about cavity-preventing foods, but there are definitely foods that you can eat to strengthen your teeth and gums. Calcium-containing foods like yogurt, milk, and cheese get a lot of mention for building strong bones, but they can also help build strong teeth.

I found an interesting article regarding a study that showed that eating grapefruit signficantly reduces gum bleeding. Though the study was focused on grapefruit, I imagine that any food high in vitamin C would have a similar effect. Vitamin C plays a key role in collagen synthesis, and people with scurvy (vitamin C deficiency) often lose their teeth because their gums cannot support them any longer. So I think vitamin C is an essential part of a health-tooth diet.