How to Tell If a Tooth Is Infected: Symptoms Dubai Patients Should Know

How to tell if a tooth is infected starts with understanding that tooth pain, swelling, pus, a bad taste, or pain when biting may be warning signs, but only a dentist can confirm the cause. Some infected teeth cause strong pain from the beginning. Others cause mild symptoms, pain that comes and goes, or very little discomfort until the infection becomes more serious.

A tooth infection may begin when bacteria reach the soft tissue inside the tooth through deep decay, a crack, trauma, or a damaged filling or crown. Infection can also develop around the gums. The right treatment depends on where the infection started, whether the tooth can be saved, and whether symptoms are becoming urgent.

For patients in Dubai, early dental assessment can help identify whether the problem requires a filling, gum treatment, root canal treatment, drainage, or extraction. If you have facial swelling, fever, difficulty swallowing, difficulty breathing, or swelling spreading toward the eye, jaw, or neck, seek urgent dental or medical care.

This article is for general education only. It does not replace a dental examination, X-ray, diagnosis, or treatment advice from a licensed dentist.

Quick Answer: What Are the Signs of an Infected Tooth?

Possible signs of an infected tooth include persistent toothache, throbbing pain, pain when biting, lingering sensitivity to hot or cold, swollen gum, a pimple-like bump on the gum, pus, bad taste, facial swelling, fever, or feeling unwell.

Not every toothache means infection. Sensitivity, a cracked filling, gum recession, jaw problems, or a cavity that has not reached the nerve can also cause pain. A dental examination is needed to confirm what is happening.

The situation may become urgent if you have:

• Facial swelling
• Fever
• Swelling near the eye, neck, or under the jaw
• Difficulty opening your mouth
• Difficulty swallowing
• Difficulty breathing
• Severe pain that is rapidly getting worse

If you have these symptoms, arrange urgent care rather than waiting for the pain to settle.

What Is a Tooth Infection?

A tooth infection happens when harmful bacteria enter the tooth or nearby supporting tissues and begin causing inflammation or pus.

Inside each tooth is a soft tissue called the pulp. It contains nerves and blood vessels. When bacteria reach the pulp through decay, cracks, trauma, or leaking dental work, the pulp can become inflamed or infected.

A tooth infection may develop:

• Inside the tooth pulp
• Around the tip of the tooth root
• In the gum surrounding the tooth
• Around a previously treated tooth
• Under a damaged filling or crown

An infection that begins inside the tooth may eventually form a pocket of pus near the root. This is known as a tooth abscess. For a full explanation, read what is a tooth abscess and how serious is it.

Common Signs That a Tooth May Be Infected

Persistent or Throbbing Toothache

A tooth infection may cause pain that does not settle. The pain may feel deep, throbbing, sharp, or constant.

Some patients notice pain that becomes worse at night or when lying down. Others feel pain spreading toward the jaw, ear, cheek, or nearby teeth.

A painful tooth does not always mean infection, but persistent or worsening pain should be checked.

Pain When Biting or Chewing

Pain when you bite can happen when inflammation or infection affects the tissues around the tooth root. It may also happen with a cracked tooth, high filling, or damaged crown.

If chewing pressure causes sharp or deep pain, a dentist may need to examine the tooth and take an X-ray.

If you are unsure whether a painful tooth needs a filling or treatment inside the tooth, read do I need a root canal or filling.

Lingering Sensitivity to Hot or Cold

Brief sensitivity can happen with enamel wear, gum recession, whitening products, or a small cavity. But sensitivity that continues after hot or cold food or drink has been removed may suggest that the pulp inside the tooth is badly inflamed.

This symptom should not be ignored if it becomes stronger, lasts longer, or occurs with toothache or biting pain.

Swollen Gum Near One Tooth

A swollen gum around one tooth may indicate infection, gum disease, trapped food, or irritation. If the swelling is painful, keeps returning, or is linked with pus or a bad taste, it needs dental assessment.

The dentist will need to determine whether the source is inside the tooth or in the gum tissue.

Gum Pimple or Small Boil

A small pimple-like bump on the gum near a tooth may be a drainage point from infection around the tooth root. It may release pus or leave a bad taste in the mouth.

A gum pimple can come and go. Even if it drains and feels better, the infection may still remain.

Do not try to squeeze, puncture, or drain it yourself.

Pus or Bad Taste in the Mouth

Pus or a foul taste near one tooth can be a sign of infection. Some patients notice a sudden bad taste after a gum swelling drains.

Pain relief after drainage does not confirm that the infection is gone. The source still needs professional treatment.

Tooth Becomes Darker or Grey

A tooth that becomes darker, grey, or discoloured after trauma or severe decay may have damage to the pulp inside the tooth.

Discolouration alone does not confirm infection, but it is a reason to arrange a dental check, especially if the tooth has been painful or injured.

Facial Swelling

Swelling of the cheek, jaw, face, or area under the eye may suggest that infection is spreading beyond the tooth.

Facial swelling needs prompt dental attention. Swelling with fever, breathing difficulty, swallowing difficulty, or spread toward the eye or neck requires urgent care.

Fever or Feeling Unwell

A tooth infection can sometimes be associated with fever, fatigue, swollen glands, or feeling generally unwell.

Fever with dental pain or facial swelling should not be ignored. Contact a dentist urgently or seek medical care if symptoms are severe.

Infected Tooth vs Tooth Abscess: What Is the Difference?

A tooth infection is the broader condition. It means bacteria are causing infection inside or around a tooth.

A tooth abscess is a collection of pus that may form because of that infection. An abscess can occur near the root of the tooth or in the gum tissue.

Not every tooth infection has already formed an abscess, but an untreated infection can progress.

For symptoms, risks, and treatment of an abscess, read what is a tooth abscess and how serious is it.

Can a Tooth Be Infected Without Severe Pain?

Yes. A tooth can be infected even when pain is mild, intermittent, or absent.

In some cases, a badly damaged tooth nerve may stop responding, causing pain to reduce. But bacteria may still remain inside the tooth and spread around the root.

Dubai Health Authority’s 2026 endodontic guideline describes a chronic apical abscess as an infection linked to pulpal infection and necrosis that may cause little or no discomfort while producing intermittent pus drainage through the gum. This means lack of strong pain does not always rule out an infection.

If severe pain suddenly reduced but you still notice swelling, a gum pimple, pus, bad taste, or tooth discolouration, arrange a dental examination.

Read more here: how long will a tooth hurt before the nerve dies.

What Causes a Tooth Infection?

A tooth infection can start for several reasons.

Untreated Cavities

A small cavity begins in the outer tooth structure. If it is not treated, decay can move deeper toward the pulp. Once bacteria reach the inner tissue, the tooth may become infected.

Cracked or Broken Tooth

A crack or fracture can allow bacteria to enter the inside of the tooth. This may happen after biting something hard, an accident, or weakening of the tooth from large fillings.

Damaged Filling or Crown

A filling or crown that cracks, loosens, or leaks may allow bacteria to reach the tooth underneath.

Dental Trauma

A tooth that has been hit or injured may develop pulp damage even if it does not break visibly. Symptoms may appear immediately or later.

Gum Disease

Infection can develop in the supporting tissues around a tooth due to periodontal disease. This type of infection may require gum treatment rather than root canal treatment.

Previously Treated Tooth

A tooth that previously had root canal treatment may become infected again if bacteria enter through a leaking restoration, a missed canal remains, or the tooth develops a crack.

If symptoms developed after root canal treatment, read signs of infection after a root canal.

Warning Signs That Need Urgent Dental Care

Some symptoms suggest that the infection may be spreading or becoming more serious.

Seek urgent dental care if you have:

• Facial swelling
• Swelling in the cheek, jaw, or under the jaw
• Swelling spreading toward the eye or neck
• Fever with tooth pain or swelling
• Pus or foul-tasting discharge
• Severe pain that does not settle
• Difficulty opening your mouth
• Difficulty swallowing
• Difficulty breathing
• Feeling very unwell with a dental infection

Mayo Clinic advises emergency care if a tooth abscess is linked with trouble breathing or swallowing, and also advises urgent attention when facial swelling and fever are present.

If pain or infection may require urgent treatment inside the tooth, read emergency root canal treatment.

Does an Infected Tooth Need Root Canal Treatment?

Not every infected tooth needs the same treatment.

If the infection started inside a tooth that can be restored, root canal treatment may be recommended. During a root canal, the dentist removes infected or dead tissue from inside the tooth, cleans and disinfects the canals, fills them, and seals the tooth.

If the infection is mainly in the gum tissue, periodontal treatment or drainage may be more appropriate.

If the tooth is badly cracked, severely damaged, or cannot be safely restored, extraction may be recommended instead.

Only a dentist can decide the appropriate treatment after examining the tooth and taking any needed imaging.

For a step-by-step guide to the procedure, read what happens during a root canal.

How Does a Dentist Diagnose a Tooth Infection?

A dentist needs to identify where the problem started and whether the tooth can be saved.

The assessment may include:

• Asking when the pain began
• Checking whether pain is triggered by hot, cold, biting, or pressure
• Examining the tooth for cavities, cracks, broken fillings, or crown problems
• Checking the gum for swelling, pus, or a gum pimple
• Tapping the tooth gently
• Checking the bite
• Testing the tooth response where appropriate
• Taking a dental X-ray
• Considering further imaging for complex cases

DHA’s current endodontic guideline states that a correct pulpal diagnosis should be based on symptoms, symptom history, diagnostic tests, and clinical findings. It also states that treatment should not be started when a clear diagnosis cannot be established.

Can Antibiotics Cure a Tooth Infection?

Antibiotics may be needed in selected cases, especially if infection is spreading, facial swelling is increasing, fever is present, or the patient has certain health risks.

But antibiotics do not always remove the source of infection inside a tooth. If infected pulp, pus, a cracked tooth, or gum disease remains untreated, symptoms may return.

Treatment may still involve:

• Root canal treatment
• Drainage
• Gum treatment
• Filling or crown repair
• Extraction if the tooth cannot be saved

Do not take leftover antibiotics or start medication without professional advice.

What Happens If You Delay Treatment?

An infected tooth may become more painful or develop complications if treatment is delayed.

Possible outcomes include:

• Worsening pain
• Pain when chewing
• Formation of an abscess
• Gum swelling
• Facial swelling
• Bone damage around the tooth root
• More complex treatment
• Loss of the tooth
• Spread of infection into nearby tissues

A small cavity may be treated more simply when found early. Once the pulp is infected, treatment may become more involved.

For more information, read what happens if you delay a root canal.

Tooth Infection Treatment Cost in Dubai

The cost of treating an infected tooth in Dubai depends on the diagnosis and the treatment needed.

The final cost may be affected by:

• Dental consultation
• X-ray or other imaging
• Emergency appointment timing
• Drainage of infection
• Root canal treatment
• Tooth type, such as front tooth, premolar, or molar
• Need for specialist care
• Final filling or crown
• Tooth extraction
• Follow-up care

A tooth that needs root canal treatment may cost more if it is a molar, has complex canals, requires retreatment, or needs a crown afterwards.

For a fuller treatment-cost guide, read root canal cost in Dubai.

What Can You Do Until Your Dental Appointment?

If you think your tooth may be infected, arrange a dental appointment promptly. Home care may help reduce discomfort for a short time, but it cannot treat infection inside the tooth.

While waiting for your appointment, you may:

• Eat soft foods
• Avoid chewing on the painful side
• Keep the area clean
• Rinse gently with warm salt water
• Avoid foods or drinks that make pain worse
• Use over-the-counter pain relief only when suitable for you and used as directed

Do not:

• Try to drain a gum swelling yourself
• Place aspirin directly on the gum
• Use sharp objects around the painful tooth
• Take leftover antibiotics
• Ignore fever or facial swelling
• Delay care if breathing or swallowing becomes difficult

For temporary discomfort guidance, read how to stop a toothache at home.

What If the Infection Appears After Root Canal Treatment?

A tooth that has already had root canal treatment can sometimes develop symptoms again.

Possible signs include:

• Pain returning after the tooth previously felt better
• Swelling near the treated tooth
• Gum pimple or drainage
• Pain when biting
• Bad taste
• Facial swelling

These symptoms may happen because of reinfection, a leaking crown or filling, a missed canal, or a crack in the tooth.

If this applies to you, read signs of infection after a root canal. If facial swelling is present, also read facial swelling after a root canal.

How to Choose a Dentist in Dubai for a Suspected Tooth Infection

A suspected dental infection needs a proper diagnosis, not only temporary pain relief.

When choosing a dentist in Dubai, ask:

• Is the dentist licensed in Dubai?
• Can the clinic assess urgent pain or swelling?
• Will an X-ray be taken if needed?
• Is the problem inside the tooth or in the gum?
• Can the tooth be saved?
• Do I need root canal treatment, gum care, or extraction?
• Will a crown or final restoration be needed?
• What is included in the estimated cost?
• What should I do if swelling gets worse?
• Is follow-up care available?

Dubai Health Authority publishes health laws, standards, policies, and clinical dental guidelines for DHA-licensed health facilities and professionals. Its dental resources include guidance for endodontics and infection control intended to support safe, high-quality and ethical care in Dubai.

For broader guidance, read how to choose the right dentist in Dubai.

Related Dental Infection and Root Canal Guides

Tooth abscess symptoms
Emergency root canal treatment
Do I need a root canal or filling
What happens during a root canal
Root canal cost in Dubai
What happens if you delay a root canal
How long will a tooth hurt before the nerve dies
Facial swelling after a root canal
How to stop a toothache at home
How to choose the right dentist in Dubai

FAQs About an Infected Tooth

How to tell if a tooth is infected?

Possible signs include persistent tooth pain, throbbing pain, pain when biting, lingering sensitivity, gum swelling, a gum pimple, pus, bad taste, facial swelling, or fever. A dentist needs to confirm the cause.

What does an infected tooth feel like?

An infected tooth may feel painful, tender when chewing, sensitive to hot or cold, or swollen around the gum. Some people notice drainage, a bad taste, or facial swelling.

Can a tooth be infected without pain?

Yes. A tooth infection may cause mild pain or no pain, especially if the nerve inside the tooth has died or if infection is draining through the gum.

Is a gum pimple a sign of tooth infection?

A gum pimple may be a sign of infection draining from the root area, but a dentist needs to examine it to confirm the cause.

Can an infected tooth cause facial swelling?

Yes. Infection may spread into nearby tissues and cause swelling in the gum, cheek, jaw, or face. Facial swelling should be checked promptly.

What is the difference between a tooth infection and an abscess?

A tooth infection means bacteria are affecting the tooth or nearby tissues. An abscess is a pocket of pus that can develop because of infection.

Does an infected tooth always need a root canal?

No. Treatment depends on the source of infection and whether the tooth can be saved. Some cases need root canal treatment, while others may need gum treatment, drainage, restoration repair, or extraction.

Can antibiotics cure a tooth infection?

Antibiotics may help in selected spreading infections, but they usually do not remove the source inside a tooth. Dental treatment may still be needed.

When is a tooth infection an emergency?

Seek urgent care for facial swelling, fever, pus, worsening severe pain, difficulty opening the mouth, difficulty swallowing, difficulty breathing, or swelling spreading toward the eye or neck.

How much does treatment for an infected tooth cost in Dubai?

The cost depends on the diagnosis, X-rays, emergency care, drainage, root canal treatment, crown needs, tooth extraction, and whether specialist care is required.

Final Advice

An infected tooth may cause pain, swelling, sensitivity, pus, or a bad taste, but symptoms are not always severe. Pain may even reduce while infection remains.

For patients in Dubai, the safest step is to arrange a dental examination when tooth pain persists, returns, or appears with swelling. If you have facial swelling, fever, trouble swallowing, or breathing difficulty, seek urgent dental or medical care immediately.