Conditions
Cavity (dental caries)
A cavity, also called dental caries, is a small hole in a tooth caused by decay. It starts when acid from bacteria breaks down the enamel.
A cavity is a little hole in your tooth. It forms when bacteria in dental plaque use the sugars in food and drink to make acid. The acid attacks the enamel. Over time the enamel can break down. The hole can then grow into the dentin under it.
Cavities are more common in children, but adults get them too. In older adults, receding gums can expose the root, which can decay as well. See root decay.
Brushing twice a day with fluoride toothpaste, cleaning between teeth daily, limiting snacks and visiting the dentist regularly all help prevent cavities. A dentist can find a cavity with an exam and x-rays. A dental filling is a common way to repair one. See our page on dental fillings.