What Is a Dental Abscess?
A dental abscess is an infection that produces a collection of pus inside a tooth, in the gum, or in the jawbone that supports the teeth. The infection is caused by bacteria that enter the tooth through a cavity, crack, or gum pocket.
The body responds to the bacterial invasion by sending white blood cells to fight the infection. The resulting buildup of dead tissue, bacteria, and white blood cells forms pus. Because the pus has no way to drain on its own, pressure builds up and causes pain.
Dental abscesses are common. They can affect anyone, but people with untreated cavities, gum disease, or weakened immune systems are at higher risk. The infection will not resolve without professional dental care.
Types of Dental Abscess
There are three main types of dental abscess. Each one forms in a different location and has different underlying causes. Your dentist or endodontist will determine the type based on a clinical exam and X-rays.
Periapical Abscess
A periapical abscess forms at the tip of the tooth root. It happens when bacteria reach the dental pulp, the soft tissue inside the tooth that contains nerves and blood vessels. The most common cause is an untreated cavity that has reached the pulp. Trauma to the tooth or a cracked tooth can also allow bacteria to enter.
Once the pulp becomes infected, the infection spreads down through the root canal to the tip of the root, where it forms an abscess in the surrounding bone. Periapical abscesses are the most common type and are typically treated by an endodontist through root canal treatment or, in some cases, extraction.
Periodontal Abscess
A periodontal abscess forms in the gum tissue next to the tooth root. It is usually associated with gum disease (periodontitis), where bacteria accumulate in the deep pockets that form between the gum and the tooth. Food debris or tartar trapped in these pockets can trigger the infection.
Periodontal abscesses can also occur after dental procedures if bacteria become trapped in a gum pocket. Treatment typically involves draining the abscess and cleaning the infected gum pocket. A periodontist may need to treat the underlying gum disease to prevent recurrence.
Gingival Abscess
A gingival abscess is an infection that occurs only in the gum tissue, without involving the tooth or the periodontal ligament. It is often caused by something lodging in the gum, such as a popcorn hull, food particle, or broken piece of a toothpick.
Gingival abscesses are typically the least serious type. They tend to be localized and easier to treat. A dentist can usually drain the abscess and remove the foreign object if one is present.
What Causes a Dental Abscess?
A dental abscess forms when bacteria invade tissue that is normally protected. Several conditions can create an opening for bacteria to enter.
- Untreated tooth decay: A cavity that penetrates through the enamel and dentin can reach the dental pulp, allowing bacteria to infect the nerve and blood vessels inside the tooth.
- Cracked or chipped teeth: A fracture in the tooth can expose the inner layers to bacteria, even if the crack is too small to see without magnification.
- Gum disease (periodontitis): Advanced gum disease creates deep pockets between the teeth and gums where bacteria thrive. These pockets can trap debris and lead to periodontal abscesses.
- Previous dental work: Teeth that have had large fillings, crowns, or other restorations can develop new decay around the edges of the restoration, creating a pathway for infection.
- Weakened immune system: People with diabetes, autoimmune conditions, or those undergoing chemotherapy may be more susceptible to dental infections.
- Dry mouth: Saliva helps wash away bacteria. Medications or conditions that reduce saliva production can increase the risk of tooth decay and abscess formation.
Dental Abscess Symptoms
The symptoms of a dental abscess can range from mild discomfort to severe pain and swelling. Some abscesses develop gradually over weeks, while others seem to appear suddenly. Recognizing the symptoms early can help you get treatment before the infection worsens.
- Throbbing, persistent pain in the tooth, jaw, or ear on the affected side
- Pain that worsens when lying down or when biting and chewing
- Swelling in the face, cheek, or neck near the infected area
- Red, swollen, or tender gums
- A bad taste in the mouth or foul-smelling discharge if the abscess ruptures
- Sensitivity to hot and cold temperatures
- Fever and general feeling of being unwell
- Swollen lymph nodes under the jaw or in the neck
- Difficulty opening the mouth, swallowing, or breathing (this is a medical emergency)
Is a Dental Abscess a Dental Emergency?
Yes. A dental abscess is considered a dental emergency because the infection can spread if left untreated. In rare but serious cases, the infection can move to the jaw, head, neck, or even the bloodstream, a condition called sepsis.
Seek emergency care right away if you experience facial swelling that affects your eye or makes it hard to breathe, difficulty swallowing, a fever above 101 degrees Fahrenheit, or rapid heartbeat. These signs suggest the infection may be spreading beyond the tooth.
How Is a Dental Abscess Treated?
Treatment for a dental abscess depends on the type, location, and severity of the infection. The primary goal is to eliminate the infection and preserve the tooth whenever possible. Your dentist or endodontist will recommend the best approach after examining the tooth and reviewing X-rays.
Draining the Abscess
The first step in treating many abscesses is draining the pus. The dentist makes a small incision in the swollen area to allow the pus to escape. This relieves pressure and pain quickly. The area is then cleaned with a saline solution. Drainage alone does not cure the underlying cause, so additional treatment is always needed.
Root Canal Treatment
For a periapical abscess, root canal treatment is the standard approach when the tooth can be saved. An endodontist removes the infected pulp tissue from inside the tooth, cleans and disinfects the root canal system, and seals the space to prevent reinfection. After the root canal, your general dentist or a prosthodontist places a crown to protect the tooth.
Root canal treatment performed by an endodontist has a high success rate for eliminating the infection and saving the tooth. If you have been told you have an abscessed tooth and want to keep it, ask for a referral to an endodontist.
Tooth Extraction
If the tooth is too damaged to save, extraction may be necessary. An oral surgeon or general dentist removes the tooth and drains the infection. After healing, the missing tooth can be replaced with a dental implant, bridge, or other restoration. A prosthodontist can guide you through replacement options.
Antibiotics
Antibiotics alone cannot cure a dental abscess. The source of the infection, whether it is a decayed tooth or an infected gum pocket, must be physically treated. However, your dentist may prescribe antibiotics if the infection has spread beyond the immediate area, if you have a fever, or if your immune system is compromised. Antibiotics help control the infection while you receive definitive treatment.
Can a Dental Abscess Go Away on Its Own?
No. A dental abscess will not go away without professional treatment. The infection may seem to improve temporarily if the abscess ruptures and drains on its own, which can relieve pain and pressure. However, the underlying infection remains and will return.
Some people try home remedies like saltwater rinses, garlic, or over-the-counter pain relievers. While these may provide temporary symptom relief, they do not treat the infection. Delaying professional care allows the bacteria to continue damaging the tooth and bone, and the infection may spread to other areas.
If you suspect you have a dental abscess, schedule an appointment with a dentist or endodontist as soon as possible. Early treatment gives you the best chance of saving the tooth and avoiding complications.
How to Prevent a Dental Abscess
Most dental abscesses are preventable. Good oral hygiene and regular dental care are the most effective ways to reduce your risk.
- Brush your teeth twice a day with fluoride toothpaste
- Floss daily to remove plaque and food particles between teeth
- Visit your dentist for checkups and cleanings every six months
- Treat cavities early, before decay reaches the dental pulp
- Wear a mouthguard during contact sports to prevent tooth fractures
- Limit sugary foods and drinks, which feed the bacteria that cause decay
- Replace your toothbrush every three to four months
When to See an Endodontist for a Dental Abscess
If your dentist diagnoses a periapical abscess, which forms at the root tip due to infection inside the tooth, they may refer you to an endodontist. Endodontists are dental specialists with 2 to 3 years of additional training in treating infections within the tooth. They use surgical microscopes and advanced 3D imaging (CBCT) to locate and treat infections that standard X-rays may miss.
You should also see an endodontist if a previous root canal has become reinfected, if you have persistent pain after initial treatment, or if you want a second opinion before having a tooth extracted. In many cases, an endodontist can save a tooth that a general dentist has recommended for removal.
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