Abscess Tooth: What This Guide Covers
This guide explains what an abscess tooth is, why it forms, and how dentists treat it. It is written for anyone with tooth pain, swollen gums, or a suspected infected tooth.
A tooth abscess is a pocket of pus caused by a bacterial infection. The pus builds up because the body is fighting bacteria that have reached the inside of a tooth or the gum tissue around it. The infection does not go away on its own, and the pressure from the pus often causes severe tooth pain.[5]
A dental abscess can affect anyone, from young children with baby teeth to older adults. The good news is that treatment for an abscess tooth is usually straightforward when you act early. This guide walks through the types of tooth abscess, what to expect at the dentist, what affects cost, and when to see a specialist.
Understanding a Tooth Abscess
A tooth abscess is a pocket of pus that forms when bacteria infect the tooth or gum. Bacteria are the main cause, and they usually enter through tooth decay, a cracked tooth, or gum disease.[5]
The pulp is the soft tissue inside a tooth. It holds the nerves and blood vessels. When bacteria reach the pulp, they multiply and the tissue dies. Pus then collects and pushes against the bone, which is why a tooth abscess can be so painful.
Types of Dental Abscess
There are two main types of dental abscess, and they start in different places. Knowing the type of tooth abscess helps the dentist plan the right treatment.
A periapical abscess begins inside the tooth and forms at the tip of the tooth root. It usually follows deep tooth decay or a cracked tooth that lets bacteria reach the pulp. Periapical abscesses are the most common type and are the main reason a tooth needs root canal treatment.[11]
A periodontal abscess forms in the gum tissue next to the tooth, often inside a deep gum pocket caused by gum disease. A periodontal abscess can occur even when the tooth itself is healthy inside. Because the source is the gum and supporting bone, treatment focuses on cleaning the pocket rather than the inside of the tooth.[9]
Causes and Risk Factors
A dental abscess is a bacterial infection, so anything that lets bacteria reach the pulp or deep gum tissue raises your risk. The bacteria involved are usually a mix of species that live in dental plaque.[5]
Common risk factors include untreated tooth decay, large or deep fillings, a cracked or chipped tooth, and gum disease. Poor brushing and flossing, frequent sugary foods, dry mouth, and conditions that weaken the immune system can also raise the risk of an infected tooth and other tooth infections.[12]
- Untreated tooth decay that reaches the pulp
- A cracked, chipped, or broken tooth root or crown
- Deep fillings or repeated dental treatment on the same tooth
- Gum disease that creates deep pockets in the gum tissue
- Dry mouth or a weakened immune system
Symptoms to Watch For
Most people notice a tooth abscess because of pain, but symptoms vary. A throbbing, severe tooth pain that may spread to the jaw, ear, or neck is common. The affected tooth often feels tender when you bite.
Other signs include swollen gums, a small pimple-like bump on the gum that may leak a pocket of pus, a bad taste in the mouth, and sensitivity to hot and cold temperatures. Some people have a fever or a swollen face. If the tooth dies, the tooth pain may fade for a while, but the infection is still active.[11]
What to Know Before Treatment
A tooth abscess will not heal without dental treatment, and home remedies only ease symptoms for a short time. Plan to see a dentist as soon as you can, even if the pain settles on its own.
Antibiotics are often misunderstood. A 2018 Cochrane systematic review found little evidence that systemic antibiotics, taken alone, resolve a symptomatic acute apical abscess when proper dental treatment is also done. Antibiotics may help when there is a spreading infection or signs of illness, but they do not replace draining the pus or treating the tooth.[8]
Children, Pregnancy, and Other Situations
Baby teeth can also develop a dental abscess. Dentists may use treatments such as pulpotomy or pulpectomy to save an infected primary tooth when the outlook is reasonable, and studies report good success rates for these methods in many cases.[7][4] For early decay in baby molars, less invasive caries management is sometimes an option.[10]
Pregnancy does not change the need to treat a tooth abscess, since an untreated infection can carry its own risks. When antibiotics are needed during pregnancy, dentists choose options with a known safety record and avoid drugs that may harm the baby. Tell your dentist if you are pregnant or might be.[6]
Younger patients with an immature permanent tooth that has lost its pulp may be candidates for regenerative endodontics, which aims to help the tooth root keep developing. Research on this approach continues to grow, and results vary by case.[2]
What to Expect During Treatment
Treatment for a tooth abscess has two goals: drain the pus and remove the source of infection. The exact steps depend on whether you have a periapical or periodontal abscess and whether the tooth can be saved.
Your dentist will start with an exam and usually an X-ray to find the abscess and judge how far the infection has spread. They will also numb the area so the visit is comfortable.
Draining the Abscess
The first step is often to drain the pocket of pus. For a periapical abscess, the dentist may open the tooth to let the infection out. For a periodontal abscess, they clean and drain the gum pocket. Draining usually brings fast relief from pressure and pain.
Root Canal Treatment
When the tooth can be saved, root canal treatment removes the infected pulp from inside the tooth. The dentist or endodontist cleans and shapes the canals, disinfects them, and seals them with a filling material. A crown is often placed later to protect the tooth.
A root canal often takes one or two visits. After root canal treatment, the tooth no longer has a living pulp, but it can stay in place and work normally for years with good care. For a deep gum infection, your dentist may add scaling and root planing, and adjunctive therapies such as antimicrobial photodynamic therapy are being studied as add-ons in periodontal care.[3]
Tooth Removal
If the tooth is too damaged to save, the dentist removes it and drains the infection. Removing the affected tooth clears the source of bacteria. You can discuss replacement options, such as an implant or bridge, after the area heals.
If the infection is severe or spreading, you may need antibiotics alongside drainage or extraction. A spreading infection that causes facial swelling, fever, or trouble breathing or swallowing is a dental emergency and needs urgent care, sometimes at a hospital.[1]
What Affects the Cost
The cost of treating a tooth abscess depends on the type of treatment, the tooth involved, and how complex your case is. Costs vary by location, provider, and case complexity, so ask for an estimate before treatment begins.
Draining an abscess is usually the least costly step. Root canal treatment costs more, and back teeth with several canals generally cost more than front teeth. A crown after a root canal adds to the total. Tooth removal is often less expensive than saving the tooth, but replacing a missing tooth later can add cost.
Many dental insurance plans help cover root canal treatment and extractions, though coverage and limits differ by plan. Emergency visits, specialist care, and imaging may be billed separately. A written treatment plan helps you compare your options fairly and avoid surprises.
When to See a Specialist
See a dentist promptly for any suspected tooth abscess. Seek emergency care right away if you have a spreading infection with facial swelling, fever, or trouble breathing or swallowing, since these signs can be life threatening.[1]
A general dentist can diagnose a dental abscess, drain it, prescribe antibiotics when needed, and perform many root canals and extractions. They are often your first stop for a tooth abscess.
An endodontist is a dentist who specializes in problems inside the tooth, including infected pulp and complex root canal treatment. You may be referred to one for a difficult periapical abscess, a tooth with curved or narrow canals, a retreatment, or a tooth that did not heal after an earlier root canal. You can learn more on the endodontics page. A periodontal abscess that involves deep gum pockets or advanced gum disease may be managed by a periodontist, who specializes in the gums and supporting bone.[9]
Find a Specialist Near You
A tooth abscess rarely improves on its own, and early care gives you the best chance to save the tooth and avoid a spreading infection. If you have tooth pain, swollen gums, or a suspected dental abscess, use our directory to find an endodontist or general dentist near you, and visit the endodontics page to learn how specialists treat infections inside the tooth.
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