August 24, 2026
A tooth infection can develop gradually, sometimes without obvious warning signs. By the time you experience severe pain or swelling, the infection may have already reached the innermost part of the tooth. This is when a root canal often becomes necessary.
What leads to such a significant tooth infection? Here are some common causes and what you can do to prevent them.
Tooth Decay
Perhaps the most common cause of a tooth infection is untreated tooth decay. A cavity begins on the outer layers of the tooth. But if it progresses without treatment, bacteria can enter the tooth and eventually reach the pulp. This area contains soft tissue, nerves, and roots, and it can become inflamed or infected.
Unfortunately, once the pulp is affected, a simple filling is often no longer enough. Root canal treatment lets us remove the infected pulp, clean and disinfect the root canals, and seal the tooth to prevent further infection.
Cracks or Fractures
Cracks or broken teeth give bacteria easy access inside the tooth. Many cracks that aren’t visible to you still provide a pathway.
A root canal can help to remove the damage or infection within the pulp. When followed by a dental crown, it restores strength and integrity. Without treatment, the crack will continue to allow bacteria in and the infection to worsen.
Dental Trauma
An injury to a tooth can damage the pulp even without a visible chip or crack. A blow from a sports injury, accident, or fall can affect the blood supply and nerves inside the tooth.
In some scenarios, the pulp may become inflamed right away. In others, it could take months or even years to feel the effects. Nonetheless, dental trauma can make an impact. When it does, root canal treatment can help.
What Happens When Left Untreated?
A tooth infection does not usually resolve on its own. As it progresses, it spreads. It can work its way deeper into the tooth and then spread to surrounding bone and tissues. You may feel pain, sensitivity, swelling, tenderness, and an abscess.
Thankfully, root canal treatment addresses the infection at its source while preserving your natural tooth.
If you are experiencing persistent tooth pain, swelling, or sensitivity, we encourage you to seek an evaluation rather than waiting any longer.
Frequently Asked Questions
Can a cavity really lead to a root canal?
Yes. When decay progresses deep enough to reach the pulp, the tissue can become infected and irreversibly inflamed. A root canal is then necessary to save the tooth.
Does a tooth infection always cause pain?
Not always. Some infected teeth cause severe pain while others may offer few noticeable symptoms. A dentist may discover an infection during a routine dental exam or through dental imaging.
Can a cracked tooth cause an infection?
Yes. A crack can allow bacteria to reach the pulp inside the tooth.
Can antibiotics cure a tooth infection?
Antibiotics may be appropriate in certain situations, but they do not eliminate the underlying source of a tooth infection.
How do we know if a root canal is necessary?
We evaluate your symptoms, examine the affected tooth, and use diagnostic tools like CBCTs to determine the source of the problem and make an accurate diagnosis.
At Towson Endodontics, we are committed to helping patients preserve their natural teeth through thorough, precise endodontic care. If you are experiencing any signs of infection, contact us today to schedule an appointment.
