Can Cavities Spread to Other Teeth?

Cavities are a common dental problem, and many people wonder: can cavities spread to other teeth? Here’s the quick answer: a cavity (the hole) doesn’t jump from one tooth to another. What does spread is the cause of cavities—sticky plaque and acid-producing bacteria. That’s why one active cavity raises your risk for more, especially on the tooth right next to it.

Key takeaways

Cavities don’t jump tooth‑to‑tooth. Bacteria and plaque do.
The tooth that contacts a cavity is at higher risk.
You can share decay-causing bacteria through saliva, but you can’t “catch a cavity.”
Early care, fluoride, good hygiene, and smart diet choices can stop or even reverse early decay.

A cavity, also called dental caries, is a small hole in a tooth caused by tooth decay. It starts when bacteria in your mouth produce acids that wear down enamel. If untreated, cavities can reach deeper layers of the tooth, causing pain, infection, and even tooth loss.

Cavities form when harmful bacteria in your mouth produce acids that wear away tooth enamel. Several factors contribute:

If untreated, cavities can cause:

While one cavity doesn’t directly “move” to another tooth, the bacteria that cause it can affect surrounding teeth.

Key points:

Signs that decay may be spreading:

Cavities themselves aren’t contagious, but the bacteria that cause them can be transmitted through saliva.

Ways bacteria can spread:

Young children are particularly susceptible. Controlling bacteria early with good oral hygiene is critical.

Stopping cavities from spreading requires consistent oral care. Follow these steps:

Daily habits:

Diet and lifestyle:

Professional care:

If a cavity has already formed, early treatment can prevent damage to other teeth. Options include:

Our team in Burnaby will assess your teeth, recommend the right treatment, and help you maintain a cavity-free mouth.

Don’t wait until a cavity becomes painful. Regular dental visits catch cavities early and protect the rest of your teeth. Contact Dr. Stuart Katz and Associates in Burnaby today to book an appointment and keep your smile healthy.