A tooth infection is a bacterial infection affecting the tooth, tooth root, or surrounding gum tissue. In some cases, the infection develops into a dental abscess, which is a pocket of pus caused by the body’s immune response to bacteria.
Tooth infections are most commonly caused by untreated tooth decay, gum disease, cracked teeth, dental trauma, or failing dental work. Symptoms may include severe toothache, swelling, sensitivity to hot or cold food and drinks, pain when chewing, bad breath, fever, or swelling in the face or jaw.
A tooth infection will not usually heal on its own. Without treatment, bacteria can spread into surrounding tissue, the jaw, neck, or bloodstream. Early dental treatment helps stop the infection, relieve pain, and reduce the risk of complications.
What Is a Tooth Infection?
A tooth infection happens when bacteria enter areas of the tooth or gum that are normally protected.
Inside every tooth is a soft inner structure called the pulp. The pulp contains nerves, blood vessels, and connective tissue that help keep the tooth alive. The hard outer enamel and dentine normally protect the pulp from bacteria. However, if bacteria enter through decay, cracks, trauma, or gum disease, infection can develop.
As the body attempts to fight the bacteria, inflammation develops around the infected tissue. Pressure builds inside the tooth or surrounding tissues, which often causes severe throbbing pain.
In some cases, pus collects around the infection. This collection of pus is called a dental abscess.
A tooth infection and a dental abscess are closely related, but they are not exactly the same thing:
- A tooth infection refers to bacterial infection affecting the tooth or surrounding tissue.
- A dental abscess refers specifically to a build-up of pus caused by infection.
This means a tooth can become infected before a visible abscess forms.
Types of Tooth Infection
Dentists usually classify tooth infections based on where the infection develops.
Periapical Abscess
A periapical abscess develops at the tip of the tooth root. This commonly happens when untreated decay or trauma allows bacteria to infect the pulp inside the tooth. The infection then spreads through the root canal system into the surrounding bone.
Patients often experience:
- Severe throbbing toothache
- Pain when chewing
- Sensitivity to pressure
- Swelling near the tooth root
Periapical abscesses are among the most common dental abscesses seen in practice.
Periodontal Abscess
A periodontal abscess affects the gum and supporting tissues around the tooth rather than the pulp itself.
This type of infection is usually linked to advanced gum disease. Bacteria collect inside deep gum pockets where the gums have pulled away from the teeth.
Symptoms may include swollen gums, tenderness, pus discharge, bad taste in the mouth, or loosening teeth.
Gingival Abscess
A gingival abscess affects only the gum tissue and does not usually involve the tooth pulp.
It may happen when food debris, plaque, or foreign material becomes trapped beneath the gum. These abscesses often cause localised swelling and tenderness in the gum itself.
Can a Tooth Infection Go Away on Its Own?
No. A true tooth infection will not usually resolve fully without professional dental treatment.
Pain may temporarily improve if:
- The abscess drains naturally
- Pressure inside the tooth reduces
- The nerve inside the tooth dies
However, this does not mean the infection has healed.
Bacteria can remain trapped inside the tooth, root canal system, or surrounding tissue even after symptoms improve. In some cases, the pain becomes less noticeable because the nerve has died, while the infection continues spreading silently beneath the surface.
The body also struggles to clear infection from inside a damaged tooth because blood supply becomes limited once the pulp becomes infected or dies. This is one reason antibiotics alone often do not completely cure dental infections.
Without treatment, complications may include:
- Tooth loss
- Bone damage around the tooth root
- Facial swelling
- Gum destruction
- Spread into deeper facial tissues
- Bloodstream infection in severe cases
Common Signs and Symptoms of a Tooth Infection
Symptoms vary depending on how advanced the infection has become and where the infection is located. Some infections develop slowly over time, while others worsen rapidly over a few days.
Persistent Throbbing Toothache
A severe throbbing toothache is one of the most common signs of infection. The pain develops because inflammation and pressure build inside the tooth and surrounding tissues. Patients often describe the pain as pulsing, deep aching, or sharp.
Pain may worsen:
- At night
- When lying down
- During chewing
- After hot or cold food and drinks
The discomfort can also spread into nearby areas such as the jaw, ear, neck, or temple.
Swelling in the Gum, Jaw or Face
Swelling usually suggests the infection has spread beyond the tooth itself. Inflammation increases blood flow and fluid around the infected area as the immune system attempts to fight the bacteria.
You may notice:
- Swollen gums
- A puffy cheek
- Tightness in the face
- Tenderness around the jaw
Rapid facial swelling should never be ignored, particularly if swelling spreads toward the eye or neck.
Sensitivity to Hot and Cold
An infected tooth often becomes highly sensitive to temperature changes because inflammation irritates the nerve inside the tooth.
You may experience:
- Sharp pain from cold drinks
- Lingering pain after hot food
- Sudden sensitivity to cold air
Unlike normal tooth sensitivity, pain from infection often continues for several seconds or minutes after the trigger is removed. Persistent sensitivity may suggest irreversible damage to the pulp.
Pain When Chewing or Biting
Pain during chewing commonly occurs when infection spreads into the tissues surrounding the tooth root. Pressure on the tooth increases irritation and inflammation around the supporting ligaments.
Patients may feel:
- Sharp pain when biting
- Tenderness around the tooth
- Difficulty chewing normally
- A feeling that the tooth sits higher than surrounding teeth
This symptom often suggests deeper root involvement.
Bad Taste in the Mouth or Bad Breath
A foul taste or unpleasant smell may occur when pus drains from the infected area into the mouth. Pus contains bacteria, dead tissue, and immune cells, which can produce:
- Persistent bad breath
- Bitter or salty taste
- Fluid discharge near the gum
Although drainage may temporarily reduce pressure and pain, it does not remove the source of infection.
Fever and Feeling Unwell
As infection becomes more severe, the immune system may trigger wider symptoms throughout the body.
These symptoms may include:
- Fever
- Chills
- Tiredness
- Sweating
- Headaches
- Feeling generally unwell
Important Note: Fever alongside swelling may suggest the infection is spreading beyond the local tooth area and requires urgent assessment.
What Causes a Tooth Infection?
Tooth infections develop when bacteria gain access to vulnerable tissues inside the tooth or gums.
Tooth Decay
Tooth decay is one of the leading causes of dental infection. Plaque bacteria feed on sugars from food and drinks and produce acids that slowly damage enamel. As decay progresses deeper into the tooth, bacteria eventually reach the dentine and pulp. Once the pulp becomes infected, inflammation and abscess formation may follow. Early decay may not cause symptoms initially, which is why regular dental examinations remain important.
Gum Disease
Advanced gum disease creates spaces between the gums and teeth called periodontal pockets. These pockets trap bacteria beneath the gumline and increase infection risk.
As gum disease progresses:
- Gums pull away from teeth
- Bone support weakens
- Bacteria spread deeper into tissues
Periodontal abscesses are more common in people with poor oral hygiene, smoking history, diabetes, or untreated gum disease.
Cracked or Broken Teeth
Cracks or fractures allow bacteria to enter the inner tooth structure. This may happen after trauma, teeth grinding, biting hard foods, or wear over time. Even small cracks invisible to the eye can allow infection to develop gradually over weeks or months.
Failed Dental Work
Old fillings, crowns, bridges, or previous root canal treatments can fail over time. Small gaps may form around restorations, allowing bacteria to enter beneath them and infect the tooth internally. Routine dental check-ups help identify failing dental work before serious infection develops.
Weakened Immune System
Certain medical conditions may increase infection risk because the immune system becomes less effective at controlling bacteria. Higher-risk groups include people with:
- Diabetes
- Cancer treatment
- Autoimmune disease
- Smoking-related illness
- Poor nutrition
Infections may progress more quickly in medically vulnerable patients.
How Do You Know if a Tooth Infection Is Getting Worse?
Certain symptoms may suggest the infection is spreading beyond the tooth into deeper tissues.
Increasing Facial Swelling
Rapid swelling involving the cheek, jaw, neck, or eye area may suggest spreading infection and requires urgent assessment.
Difficulty Swallowing or Breathing
Difficulty swallowing saliva or breathing may indicate swelling near the airway. This is a medical emergency requiring immediate hospital care.
Severe Fever or Chills
High fever with worsening symptoms may indicate spreading infection. Additional warning signs include confusion, dizziness, severe weakness, or rapid heartbeat.
Difficulty Opening the Mouth
Infection affecting deeper muscles around the jaw may cause trismus, which limits mouth opening and makes eating or speaking difficult.
When Should You See a Dentist for a Tooth Infection?
You should see a dentist as soon as possible if you have symptoms of a tooth infection or dental abscess. Common warning signs include persistent toothache, throbbing pain, gum swelling, sensitivity to hot or cold foods and drinks, pain when biting, or a bad taste in the mouth.
A tooth infection will not usually heal without professional dental treatment. Early assessment helps prevent the infection spreading into the surrounding gum, jaw, or facial tissues.
Urgent dental care is recommended if you develop:
- Swelling around the tooth, gum, jaw, or face
- Pus or discharge near the tooth
- Fever or feeling generally unwell
- Worsening pain or pressure
- Difficulty chewing or opening your mouth
At Stotfold Dental Clinic, we provide urgent dental appointments for patients experiencing tooth pain, swelling, or signs of dental infection. Our team offers assessment and treatment options including emergency dental care, root canal treatment, drainage of dental abscesses, and tooth extraction where necessary.
If you develop difficulty breathing, difficulty swallowing, or rapid facial swelling affecting the jaw, neck, or eye area, seek emergency medical care through A&E or call 999 immediately, as these symptoms may indicate a spreading infection requiring urgent hospital treatment.
How Dentists Treat a Tooth Infection
Treatment focuses on removing the infection source. Masking symptoms with antibiotics alone rarely works. The approach depends on infection severity and whether the tooth can be saved.
Draining the Abscess
Dentists drain pus to relieve pressure and remove infected material. A small incision releases the buildup. This immediately reduces pain and swelling. Drainage alone does not cure the infection. The source inside the tooth remains.
Root Canal Treatment
Root canal work removes infected pulp and cleans the root canals. The tooth is then sealed. This saves the tooth while eliminating the infection. The procedure takes one to three appointments, depending on infection severity.
We offer root canal treatment for infected teeth when the tooth structure remains strong enough to save. Preserving natural teeth maintains your bite. It also prevents surrounding teeth from shifting.
Tooth Extraction
Removing the tooth eliminates the infection source completely. This becomes necessary when root canal treatment is not possible. Extraction is faster than root canal work. However, it leaves a gap that may need filling.
Our tooth extraction treatment for severe infection includes same-day emergency appointments when urgent removal becomes necessary. Removing severely infected teeth prevents spread to the surrounding bone and tissue.
Antibiotics for Dental Infection
Clinical guidance recommends antibiotics when patients become systemically unwell or show signs of spreading infection. Fever, swollen lymph nodes, or cellulitis are situations where antibiotics become necessary alongside dental treatment.
However, antibiotics support treatment rather than replacing dental procedures because the infection source remains inside the tooth structure.
The bacteria live in areas where medication cannot reach them effectively. That is why definitive dental work to drain the abscess, perform root canal treatment, or extract the tooth remains essential.
How to Ease Pain and Prevent Another Tooth Infection
While waiting for your dental appointment, you can safely manage pain. You can also reduce discomfort. Long-term prevention habits lower the risk of future infections.
Take over-the-counter painkillers like ibuprofen or paracetamol. Follow the packet instructions carefully. Avoid placing aspirin directly on the gum. It can burn tissue. Eat soft foods that do not require heavy chewing. Rinse gently with warm salt water to keep the area clean.
Prevention steps that reduce infection risk include:
- Brushing with fluoride toothpaste twice daily
- Cleaning between teeth with floss or interdental brushes
- Replacing your toothbrush every two to three months
- Attending regular dental check-ups
- Avoiding smoking and excessive sugar intake
These habits keep teeth and gums healthy. They catch problems before they turn into infections. Regular check-ups allow dentists to spot early decay, gum disease, or failing dental work. This happens before abscesses develop.
Conclusion
A tooth infection is a serious dental condition that should not be ignored.
Symptoms such as severe toothache, swelling, sensitivity, bad taste in the mouth, or fever may indicate infection requiring urgent treatment. While some infections develop slowly, others can worsen quickly and spread into surrounding tissues.
Most tooth infections can be treated successfully when identified early. Root canal treatment, drainage, or extraction removes the source of infection and helps prevent complications.
If you think you may have a tooth infection, arrange a dental appointment promptly for professional assessment and treatment.
FAQs
How long can a tooth infection last untreated?
A tooth infection will not resolve without treatment. It can persist for weeks or months. It worsens gradually and spreads to surrounding tissue.
How quickly can a tooth infection spread?
Spreading speed varies. Some infections remain localised for days. Others spread to the jaw or face within hours if severe.
Can a tooth infection spread to your heart or brain?
Rarely, untreated infections can spread through the bloodstream. Prompt dental treatment prevents these serious complications in nearly all cases.
Can a tooth infection make you feel sick or tired?
Yes. Fever, fatigue, and feeling generally unwell are common. This happens when the infection affects your whole body rather than staying localised.
Should I sleep upright with a tooth infection?
Sleeping slightly elevated may reduce throbbing pain. This limits blood flow to the infected area. It is temporary relief while waiting for treatment.
This content is for general information only and does not replace professional dental advice. If you have symptoms of a tooth infection or feel seriously unwell, seek prompt dental or medical care.
