Visit Video : Tooth Cavity

Cavities are what you get from tooth decay -- damage to the tooth. Tooth decay can affect both the outer coating of a tooth (called enamel) and the inner layer (called dentin).

What causes decay?

When foods with carbohydrates like bread, cereal, milk, soda, fruit, cake, or candy stay on your teeth. The bacteria in your mouth turn them into acids. The bacteria, acid, food debris, and your saliva combine to form plaque, which clings to the teeth. The acids in plaque dissolve the enamel, creating holes called cavities. Throughout the day, a tug of war takes place inside our mouths.

Who Gets Cavities?

If you eat a lot of sugary or high-carb foods, you’re more likely to get cavities. Bacteria gather in the gaps and cause decay.

How Do I Know If I Have One?

Your dentist finds cavities during a regular dental checkup. He’ll probe your teeth, looking for soft spots, or use X-rays to check between your teeth.

If you’ve had a cavity for a while, you might get a toothache, especially after you eat or drink something sweet, hot, or cold. Sometimes you can see pits or holes in your teeth.

How Are They Treated?

Treatment depends on how bad the cavity is. Most often, the dentist removes the decayed portion of your tooth with a drill. He fills in the hole with a filling made of either silver alloy, gold, porcelain, or a composite resin. These materials are safe.

Some people have raised concerns about mercury-based fillings called amalgams, but the American Dental Association, the FDA, and other public health agencies say they are safe. Allergies to fillings are rare.