Root Canal Infection: Signs Your Tooth May Need Treatment

A root canal infection can develop in a tooth with deep decay that reaches the pulp, or it can occur when a previously treated tooth becomes reinfected. Recognizing when internal changes may need prompt care helps protect the surrounding bone and keep treatment more predictable.

Symptoms of a Root Canal That Is Infected

The most common symptoms of an infected root canal are persistent tooth pain, pressure, and gum swelling near the affected tooth. The pain may feel dull and constant or sharp when biting, especially if inflammation has reached the tissues around the root tip.

Common symptoms include:

• Lingering tooth pain or pressure
• Pain when chewing or tapping the tooth
• Sensitivity to hot or cold that lingers
• Swelling in the gums near the tooth
• A pimple or bump on the gums
• Pus drainage or a bad taste in the mouth
• Tooth discoloration or darkening
• Facial swelling in more advanced cases

A small gum bump or dental abscess that drains fluid is often a sign that the infection has created a pathway from the root tip to the surface.

What Does a Reinfected Root Canal Feel Like?

A reinfected root canal often feels like pain returning to a tooth that was previously treated and had been comfortable for months or even years.

Many patients notice:

• Pressure when biting on the crown
• A dull ache in the same tooth
• Gum tenderness around the root
• New swelling near an old crown
• A loose crown or filling
• A bad smell or taste around the tooth

Reinfection occurs when the seal that protects the inside of the tooth is compromised or when complex root anatomy allows bacteria to remain.

When Symptoms Need Immediate Care

Some symptoms suggest the infection is spreading beyond the tooth and should be treated quickly.

Seek prompt care if you notice:

• Increasing facial swelling
• Fever
• Pain that worsens rapidly
• Swelling under the jaw
• Trouble chewing due to pressure
• Pus drainage from the gums
• Pain that wakes you up at night

When the infection spreads into the surrounding bone or soft tissue, treatment may involve root canal therapy, re-treatment, drainage, or extraction depending on the condition of the tooth. In addition, appropriate antibiotics may be prescribed when indicated to help reduce the bacterial infection in the surrounding tissues and support healing.

Root Canal Treatment At Power Road Dental Care

Root canal infections can develop in both untreated teeth and teeth that were treated years earlier. When symptoms such as pain, swelling, or pressure appear, a thorough evaluation helps determine the source of the problem and the most appropriate next step.

Dr. Davis evaluates each situation carefully to determine whether root canal therapy or re-treatment may help preserve the tooth. In some cases, complex root anatomy or re-treatment needs may require referral to an endodontist for specialized care. He always recommends what is in the best interest of the patient and works closely with trusted specialists when advanced treatment is needed.

Dentist in Mesa, AZ

If you have lingering tooth pain, swelling near a treated tooth, or a gum bump that drains fluid, prompt treatment can help protect the tooth and prevent the infection from worsening.

To book an appointment at our dental office in Mesa, AZ, call (480) 664-1438 or visit us at 2500 S Power Rd STE 102, Mesa, AZ 85209. We proudly serve patients throughout the Phoenix East Valley, including Mesa, Gilbert, Chandler, Apache Junction, and Queen Creek. 

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