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Cavities are incredibly common, affecting 90% of adults between the ages of 19 and 64 — but they are often preventable.

Also known as "dental caries," cavities are damaged areas in the hard parts of the teeth caused by tooth decay , according to Mayo Clinic.

These areas become tiny openings or holes that can lead to toothaches, infections and even tooth loss.

How to know if you have a cavity

When a cavity is just starting, you may not have any symptoms at all. That’s why it’s important to be checked regularly at a dentist , says the Centers for Disease Control and Prevention (CDC).

Even if your mouth feels fine, a professional may be able to pick up on smaller signals before the decay grows.

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