Cavity is the most common word in this dictionary, and rarely the emergency it sounds like.

In kid words

"A cavity is a tiny hole in a tooth that the dentist can fix." Say it the same calm way you would name any other checkup word, not like bad news. Lots of kids get one at some point, and the dentist has gentle ways to make it feel whole again.

The parent version

In plain terms, a cavity is a small hole in a tooth, the point where ongoing decay has finally worn all the way through the hard outer enamel. Mainstream dentistry describes this as a gradual process, not something that appears overnight, which is exactly why it is so often caught before a family notices anything at home. A cavity found at that early stage, sometimes before it has grown past a faint spot, is generally the easiest kind to repair.

Cavities are also common, and mainstream guidance treats them as largely preventable through everyday habits like brushing and a lower-sugar diet, alongside routine checkups that catch new ones while they are still small. Even so, a cavity showing up is not a verdict on anything a family got wrong. Tooth shape, saliva, genetics and plain timing all play a role too, so it is treated here as something to fix, not something to feel guilty about. What a specific cavity means for your child's tooth, and what happens next, is worth asking your pediatric dentist directly.

Where you might hear it at our office

This is exactly why checkups carry so much weight around here. The American Academy of Pediatric Dentistry recommends one every six months for most children, and that rhythm is what lets a cavity get caught while it is still small enough for the simplest fix. Our restorative dentistry page lays out the honest ladder of repairs that follows from there, starting with a tooth-colored filling for most cavities and climbing only as far as a tooth actually needs. Whatever a specific cavity calls for, it is explained before anything begins, and nothing happens without you.

Cavity is just one entry point into the dictionary. If a different word came home with your child after a visit, browse the rest of the Kids' Dental Dictionary for the same two-part explanation.

Related words

Words that often come up alongside cavity: caries, decay, filling.