Types of tooth and mouth inflammation and their symptoms
Mouth inflammation covers a wide range of conditions, from acute infections to silent chronic processes found only on an X-ray, and each type calls for a different treatment. Understanding gum inflammation (gingivitis) is a good starting point to understand how infection can spread to deeper tissues.
Symptoms vary with the stage and location of the infection: mild discomfort, sensitivity to touch and temperature, a throbbing pain that spreads to nearby areas, local redness or swelling of the face. Fever, feeling unwell, swollen glands and difficulty opening the mouth show that the infection is spreading beyond its starting point. A bitter or bad taste in the mouth can come from a draining infection.
Fever, swelling that spreads toward the eye or neck, or difficulty swallowing or breathing require going to the emergency room immediately. In rare cases, an untreated dental infection can spread and cause sepsis, an extreme response of the body to infection and a medical emergency.
The assessment includes a clinical examination and dental X-rays and, in selected cases, 3D imaging (CBCT), done at the clinic, to evaluate bone damage and nearby structures.
Tooth infection from decay (a cavity)
Tooth decay progresses through the enamel and dentin and opens a path for bacteria toward the pulp, the living tissue inside the tooth. Because the pulp sits in a closed, rigid chamber, inflammation builds pressure and causes a strong, throbbing pain, often worse with temperature changes, when lying down or at night.
Treatment depends on how far the pulp is affected. In reversible pulpitis, where the pulp is still healthy, the decay is removed and the tooth is sealed with a filling. In irreversible pulpitis, with long-lasting spontaneous pain, the standard treatment is root canal treatment (the steps are listed in the section on pulpitis below).
Acute inflammation of the tooth pulp (pulpitis)
Acute pulpitis typically causes intense pain that simple painkillers do not relieve, extreme sensitivity to hot and cold, and pain that lingers after the stimulus stops. Diagnosis relies on tapping the tooth, cold and heat tests, pulp testing and X-rays.
- Local anesthesia and direct access to the pulp chamber, preserving as much tooth as possible
- Careful removal of all the infected pulp tissue
- Electronic measurement of the root canal length
- Shaping of the canals to allow thorough disinfection
- Multi-step irrigation with antibacterial solutions
- Tight sealing of the canals
An acute tooth infection is often a dental emergency: relieving the pressure inside the tooth is the priority, and it usually brings fast relief. The clinic sees urgent cases the same day during opening hours. See emergency dentist in Jerusalem for what to do first.
Infection in the bone around the root tip
When infection spreads beyond the root tip into the jawbone, bacteria and their toxins cause a local bone inflammation (apical periodontitis), visible on an X-ray as a dark area around the root tip.
In the acute phase, the tooth hurts when touched or when chewing, may feel "longer" than the others, and the area can swell. The tooth often no longer responds to pulp tests, which confirms that the pulp has died.
Treatment is a thorough cleaning of the root canal system, sometimes with an antibacterial dressing left inside the canals for a period before the final filling. Bone healing is gradual and is followed with control X-rays.
In most cases of toothache, inflamed pulp or a localized abscess, the main treatment is dental treatment (root canal treatment, drainage or extraction), not antibiotics. According to the ADA guideline, antibiotics are considered when there are general signs such as fever or feeling unwell, and they are prescription-only, decided by the dentist or doctor (Lockhart et al., 2019).
Tooth infection after an injury
A blow to a tooth can cause immediate damage, or damage that appears months or even years later. Fractures, loosening, partial or complete displacement of the tooth and injury to the bone each require a specific protocol. An injury can also damage the blood vessels at the root tip and lead to silent death of the pulp, which is why the dentist follows an injured tooth over time with pulp tests and X-rays. Treatment may include splinting the tooth, root canal treatment and, sometimes, minor surgery at the root tip.
Examination, treatment plan and price quote
detailed and personalized
During the consultation, Dr Haim Aseriel examines your teeth, explains all the options and gives you a transparent price quote, with no obligation. The clinic is at 12 HaTnufa Street, Jerusalem.
Infection around a wisdom tooth (pericoronitis)
When a wisdom tooth erupts only partly, the gum flap covering it traps food and bacteria and can become acutely infected. Symptoms include severe pain at the back of the jaw, difficulty opening the mouth, swollen and red gums and sometimes pus under the flap.
Treatment in the acute phase
The goal is to control the infection and allow drainage. Rinsing or irrigating under the gum flap is done at the clinic, or only on the explicit instruction of your dentist: do not prepare hydrogen peroxide solutions at home or inject them into the area. Antibiotics are considered only when there are general signs (fever, feeling unwell) or spreading infection, and they are prescription-only. See also wisdom tooth pain and infection.
Once the inflammation settles
The dentist assesses whether the tooth can erupt normally, and decides whether to keep it or recommend a planned wisdom tooth removal to prevent repeated episodes.
Can a tooth infection be silent, without pain?
Yes: a tooth infection does not always hurt. Chronic infection inside the tooth or around the root tip can develop gradually, without obvious symptoms, and damage the supporting bone before it is discovered.
When the nerve of the tooth has died, the tooth loses sensation, so even an active infection may not hurt. Only a careful examination can reveal it: negative pulp tests, a dark area around the root tip on an X-ray, a darkened tooth, slight gum swelling or a small draining opening on the gum (fistula). Regular check-ups with X-rays when indicated detect these silent infections before they become an acute abscess or cause irreversible bone loss.
What causes tooth and mouth inflammation?
The main cause of dental infection is bacteria entering through openings or damage in the tooth's hard outer layers, but general diseases, medications, poor oral hygiene and a sugar-rich diet also play a role.
01
Dental plaque
Plaque is a biofilm of hundreds of bacterial species, some of which produce acids, enzymes and toxins that break down tissue.
02
Tooth decay
Decay is caused by acids that bacteria produce from dietary sugars. When it reaches deep enough, bacteria invade the pulp. Uncontrolled diabetes, autoimmune diseases and medications that reduce saliva lower the mouth's natural defenses.
03
Individual risk factors
Grinding (bruxism) and injuries create micro-cracks that let bacteria in, and mouth sores can be entry points for secondary infection. Prevention combines risk assessment, good hygiene, gum care and well-sealed restorations.
How is a tooth or mouth infection treated?
Treatment removes the source of infection, controls the symptoms, restores the damaged tooth and prevents recurrence. In most cases the main treatment is the dental treatment itself, not antibiotics. With an infection under a crown, the crown and its seal are checked; sometimes the crown must be removed, the root canal treated, and a new crown made.
- Medical history and general health assessment
- Digital X-rays and pulp tests
- Local anesthesia
- Treatment of the source: root canal treatment, abscess drainage or extraction, depending on the tooth
- Restoration of the tooth and follow-up, including a control X-ray of bone healing
Dr Haim Aseriel, a US-trained dentist (DDS, NYU College of Dentistry), explains the diagnosis and the options in English, with a written plan and itemized receipts you can submit to your insurer. The clinic is at 12 HaTnufa Street in Talpiot, south Jerusalem, open Sun 8:00–19:00 · Mon 9:00–19:00 · Tue–Wed 9:00–21:00 · Thu 8:30–21:00 · Fri 8:00–14:00.
Tooth and mouth infection: frequently asked questions
No. Home measures can ease the pain for a while, but they do not treat the infection: the main treatment is dental treatment, such as root canal treatment, abscess drainage or extraction, not antibiotics. For pain relief until your appointment, ask a pharmacist which medicine and dose suit you, and do not prepare hydrogen peroxide rinses at home.
Not necessarily. The tooth can often be saved with root canal treatment, which removes the infected tissue from inside the tooth. Extraction is considered when the tooth is too damaged to restore, or for repeated infections around a wisdom tooth. The decision is made after an examination and an X-ray.
Yes. A tooth infection does not always hurt. Chronic infection inside the tooth or around the root tip can develop gradually without obvious symptoms and damage the supporting bone before it is discovered, often on an X-ray during a check-up.
In most cases of toothache, inflamed pulp or a localized abscess, the main treatment is dental treatment, such as root canal treatment, drainage or extraction, not antibiotics. According to the ADA guideline, antibiotics are considered when there are general signs such as fever or feeling unwell, and they are prescription-only, decided by the dentist or doctor.
Sources
- Lockhart PB et al., Journal of the American Dental Association, 2019 – View the study
- American Dental Association, Antibiotics for Dental Pain and Swelling Guideline, 2019 – View the page
- Walsh LJ, Australian Dental Journal, 2000 – View the study
- National Institute of General Medical Sciences (NIH), Sepsis – View the page
