Can a cavity spread to other teeth? | Dentist Answer

# Can a cavity spread to other teeth? *Quick Dental Answer | 2026-02-25* ## The Short Answer > **Yes. Cavities are caused by **bacteria** (Streptococcus mutans) required. These bacteria can spread to adjacent teeth through saliva or direct contact. If one tooth has a hole, the neighboring tooth is at **high risk**.** ## Clinical Explanation Treating a small cavity with a composite filling is quick and inexpensive. Delaying treatment allows the decay to reach the pulp (nerve), necessitating a [Root Canal](/treatments/root-canal-treatment). Flossing between teeth is the single best way to prevent cavities from spreading. ## Related Treatments * Tooth Fillings * [Invisalign](/treatments/invisalign-aligners) ## When to see a doctor? If you are experiencing this issue, it is best to get a professional evaluation. --- *Answered by Dr. Dhivakaran, Noble Dental Care.*