What is apical periodontitis?

Has a dentist mentioned apical periodontitis, or pointed to a spot on your X-ray? It’s a mouthful of a name, and it’s reasonable to want to know what it means. It is inflammation in the tissues around the tip of a tooth root. You may feel pain when you bite, or you may feel nothing at all.¹ The next step is to find out what’s causing it and what your tooth needs. 

What you'll learn: 

• Why inflammation can develop around a tooth's root tip 

• How apical periodontitis differs from gum disease and an abscess 

• What symptoms and dental tests can tell your provider 

• Which treatment options and follow-up care may be needed 

Have questions about a tooth or an X-ray finding? Schedule an examination with an Aspen Dental provider to discuss what it means for your care. 

What causes apical periodontitis? 

Often, the problem begins inside the tooth. Its soft center, called pulp, contains nerves and blood vessels. Decay or damage can allow bacteria to reach this tissue. Infection can then extend toward the root tip and surrounding bone. An injury can also damage the pulp without leaving a visible crack.²

Your dentist checks both the tissue inside the tooth and the area around its roots. A full diagnosis covers both, and they are separate findings.¹ Understanding the cause helps your provider choose treatment instead of treating only the spot that hurts. 

Is apical periodontitis the same as gum disease or an abscess? 

No. They can affect nearby tissues, but they are different problems: 

• Apical periodontitis describes inflammation around the root end.¹ 

• Gum disease is an infection that inflames the tissues surrounding your teeth.² 

• A dental abscess contains pus caused by infection. It can develop near a root tip or elsewhere around a tooth.² 

Inflammation at a root tip does not automatically mean an abscess has formed. Your dentist considers the examination along with imaging to distinguish these conditions.¹ 

What are the symptoms of apical periodontitis? 

Dentists use “symptomatic” and “asymptomatic” to describe whether the condition causes symptoms. 

Symptomatic apical periodontitis 

A tooth may hurt when you bite, when your dentist taps it or when pressure is applied nearby. X-rays may or may not show changes around the root.¹

Asymptomatic apical periodontitis 

This form involves inflammation and bone changes around the root without pain. It may be found on a dental X-ray.¹ Feeling comfortable doesn't tell your dentist whether the area needs treatment. If the finding was unexpected, ask your provider to point it out and explain what other tests show. 

How do dentists diagnose apical periodontitis? 

Diagnosis combines your dental history, an examination, imaging and tests. Your provider may check your gums, tap the tooth and assess its response to cold or an electric pulp test. These responses provide clues, not a definitive answer by themselves.¹

Your dentist also interprets any dark area near a root tip alongside those findings. An X-ray alone cannot establish the diagnosis, and significant symptoms can occur without obvious X-ray changes.¹ If you've had a root canal before, share when it was completed and whether older X-rays are available for comparison. 

How is apical periodontitis treated? 

Treatment depends on the cause, previous care and whether the tooth can be restored.³ Your dentist may refer you to an endodontist, a specialist in treatment inside the tooth. 

Root canal treatment or retreatment 

Root canal treatment may help preserve a tooth with diseased pulp. The infected tissue is removed, and the space is filled to prevent another infection.² Understanding what to expect before and after a root canal can help you prepare for those appointments. 

For a tooth that already had root canal treatment, another procedure may be considered if a treatable problem remains.³ The recommendation should explain why more treatment is needed and what it aims to address. 

Surgery or extraction 

Some teeth may benefit from surgery around the root end when nonsurgical treatment isn't enough. Extraction may be considered when the tooth's damage or supporting tissues make keeping it unlikely to succeed. A dark area around a root does not automatically mean the tooth cannot be saved.³

Ask about the expected outcome for your particular tooth and the alternatives before deciding on a treatment plan. 

Are antibiotics needed for apical periodontitis? 

Not routinely. For most healthy adults with a localized problem around a tooth, treating the tooth itself takes priority over antibiotics. Antibiotics may be needed when the infection has spread beyond the tooth and causes signs such as fever or feeling generally unwell.⁴ They don’t replace treatment of the source. 

Tell your dentist about your health conditions and medications so the recommendation fits your circumstances. 

When should you seek urgent care? 

Contact a dentist promptly for tooth pain or a swollen gum bump. If you have a tooth abscess with facial swelling, difficulty swallowing, confusion, an elevated heart rate or a fever of 100.4°F or higher, seek emergency-room care.² 

For an existing diagnosis or an unexplained X-ray finding, schedule an examination with your local dental provider to understand your next steps. 

What is apical periodontitis? FAQs 

Does pain going away mean the tooth has healed? 

No. With a tooth infection, pain can stop even while bacteria continue damaging tissue.² Keep your appointment if symptoms improve before you are seen. Tell your provider what changed rather than assuming the problem has resolved. 

Why might I need follow-up X-rays after treatment? 

Follow-up images help your provider assess changes around the root over time. The American Association of Endodontists’ treatment guide shows healing being checked at recall visits months or even years after treatment.³ Ask when to return and what findings would mean you need further evaluation. 

Will I definitely need a tooth extraction? 

No. Many teeth with apical periodontitis can be treated successfully. The outlook depends on factors such as remaining tooth structure, fractures and bone support.³ Ask your dentist to explain which factors affect your tooth and whether a specialist's assessment would help. 

Sources 

¹ American Association of Endodontists, Endodontics Colleagues for Excellence: “Endodontic Diagnosis.” https://www.aae.org/specialty/wp-content/uploads/sites/2/2017/07/endodonticdiagnosisfall2013.pdf 

² Cleveland Clinic: “Abscessed Tooth.” https://my.clevelandclinic.org/health/diseases/10943-abscessed-tooth

³ American Association of Endodontists: “Treatment Options for the Compromised Tooth: A Decision Guide.” https://www.aae.org/specialty/wp-content/uploads/sites/2/2017/06/2014treatmentoptionsguidefinalweb.pdf 

⁴ American Dental Association, The Journal of the American Dental Association: “Evidence-Based Clinical Practice Guideline on Antibiotic Use for the Urgent Management of Pulpal- and Periapical-Related Dental Pain and Intraoral Swelling.” https://jada.ada.org/article/S0002-8177(19)30617-8/fulltext