What Is a Dental Abscess?

A dental abscess is a localized collection of pus caused by a bacterial infection in or around a tooth. It represents the body’s attempt to contain an infection — but without treatment, the infection will continue to spread and can become a serious medical emergency.

Types of Dental Abscesses

Periapical Abscess

• Originates at the tip of the tooth root

• Most common type

• Caused by bacterial invasion of the pulp (nerve) through decay or a crack

• The infection exits through the root tip into the surrounding bone

Periodontal Abscess

• Originates in the gum tissue or bone surrounding the tooth

• Associated with advanced gum disease

• Bacteria trapped in a periodontal pocket causes localized infection

Pericoronal Abscess

• Around the gum tissue overlying a partially erupted tooth (most commonly wisdom teeth)

• Caused by bacteria trapped under the gum flap

Recognizing a Dental Abscess

Symptoms

• Severe, throbbing toothache — often constant

• Swelling of the face, cheek, or jaw

• Tender, swollen lymph nodes under the jaw or neck

• Fever and general feeling of illness

• Gum pimple (sinus tract) — a small bump that may drain foul-tasting fluid

• Difficulty opening the mouth or swallowing

When to Seek Emergency Care

Go to an emergency room immediately if you experience:

• Difficulty swallowing or breathing

• Swelling spreading to the neck or floor of the mouth

• High fever (over 101°F / 38.3°C)

• Rapidly spreading facial swelling

These signs may indicate Ludwig’s angina or spreading cellulitis — life-threatening conditions requiring immediate hospital care.

Treatment Options

Drainage

The primary treatment for an abscess is establishing drainage to release the pus and relieve pressure:

• Incision and drainage (I&D): A small incision made in the swollen tissue to drain the abscess

• Root canal treatment: Drains the infection through the tooth’s root canal system

• Extraction: Removes the source of infection entirely

Antibiotics

Antibiotics alone cannot cure a dental abscess — they treat the surrounding infection but cannot reach the source inside the tooth or periodontal pocket. They are used in conjunction with drainage, not instead of it. Indications for antibiotics include:

• Spreading infection (cellulitis)

• Systemic signs (fever, malaise)

• Immunocompromised patients

• As a bridge to definitive treatment

What to Expect at Your Appointment

1. Clinical examination and X-rays to identify the source

2. Local anesthesia — infected tissue can be harder to numb; Dr. Kim will ensure adequate anesthesia before proceeding

3. Drainage established (I&D and/or root canal access)

4. Antibiotics prescribed if indicated

5. Definitive treatment planned and scheduled

6. Follow-up to confirm resolution

Why Dental Infections Must Be Taken Seriously

Unlike most dental problems that cause inconvenience, dental infections can be life-threatening if left untreated:

• Infection can spread along tissue planes to the neck and chest

• Airway compromise is possible with rapidly spreading infections

• Sepsis (bloodstream infection) can develop in severe cases

• Patients with compromised immune systems, diabetes, or heart conditions are at higher risk