Tooth infection symptoms can range from mild sensitivity to severe pain, swelling, and fever. In many cases, these signs indicate a dental abscess — a serious condition that requires prompt treatment.
Recognising the early warning signs of a tooth infection can help you avoid complications such as spreading infection, tooth loss, or emergency hospital care.
In this guide, we explain the symptoms, causes, and treatment options so you know exactly when to see a dentist.
Common Tooth Infection Symptoms
- Severe, throbbing toothache
- Sensitivity to hot and cold
- Swelling in the gums, face, or jaw
- Bad taste in the mouth
- Persistent bad breath
- Fever or feeling unwell
- Difficulty chewing or opening the mouth
What Is a Tooth Infection?
A tooth infection occurs when bacteria enter the inner part of the tooth, known as the dental pulp. This soft tissue contains nerves, blood vessels, and connective tissue.
When infected, the condition can develop into a tooth abscess, which is a pocket of pus caused by bacterial infection.
Types of Tooth Abscess
| Type | Description |
|---|---|
| Periapical abscess | Forms at the tip of the tooth root, usually from untreated decay |
| Periodontal abscess | Develops in the gums beside the tooth due to gum disease |
| Gingival abscess | Occurs in gum tissue, often from trapped food or debris |
What Causes a Tooth Infection?
A tooth abscess develops when bacteria invade the tooth or surrounding gum tissue.
Common causes include:
- Untreated Tooth Decay
- Cavities allow bacteria to reach deeper layers of the tooth.
- Cracked or Broken Teeth
- Even small cracks can expose the inner tooth to bacteria.
- Gum Disease
- Advanced gum disease creates pockets that trap harmful bacteria.
- Poor Oral Hygiene
- Infrequent brushing and flossing allow plaque buildup.
- Dental Trauma
- Injuries can damage the pulp and allow infection to develop.
- Sugary Diets
- High sugar intake feeds bacteria that produce enamel-damaging acids.
7 Warning Signs You Should Never Ignore
- Persistent Tooth Pain
- Ongoing throbbing or sharp pain is often the earliest sign. Pain may spread to the jaw, ear, or neck.
- Sensitivity to Hot and Cold
- Lingering sensitivity after eating or drinking can indicate pulp infection.
- Swelling in the Face or Jaw
- Visible swelling is a clear sign the infection may be spreading.
- Red or Tender Gums
- Inflamed gums around a specific tooth can signal infection.
- Bad Taste or Bad Breath
- Pus drainage can cause a persistent unpleasant taste or odour.
- Fever or Feeling Unwell
- Your body may respond with fatigue, fever, or general illness.
- Difficulty Opening the Mouth
- Severe infections can affect jaw movement and swallowing.
When Is a Tooth Infection an Emergency?
You should seek immediate dental or medical care if you experience:
- Severe facial swelling
- Difficulty breathing or swallowing
- High fever
- Swelling spreading to the eye or neck
These symptoms may indicate that the infection is spreading and requires urgent treatment.
How Dentists Treat a Tooth Infection
Treatment depends on the severity and location of the infection. The goal is to remove the infection, relieve pain, and preserve the tooth whenever possible.
- Draining the Abscess
- A small incision is made to release pus and reduce pressure.
- Root Canal Treatment
- The infected pulp is removed, and the tooth is cleaned and sealed.
- Tooth Extraction
- If the tooth cannot be saved, it may be removed to stop the infection.
- Antibiotics
- Used when infection spreads beyond the tooth.
Important: Antibiotics alone do not cure a tooth abscess. Dental treatment is always required.
How to Prevent Tooth Infections
Most tooth infections can be prevented with consistent oral care.
Simple habits that protect your teeth:
- Brush twice daily with fluoride toothpaste
- Floss every day
- Limit sugary foods and drinks
- Drink fluoridated water
- Replace your toothbrush every 3–4 months
- Visit your dentist regularly
The most effective prevention is not delaying dental visits.
Experiencing Tooth Pain or Swelling? Act Early
Tooth infections can worsen quickly if left untreated.
👉 Call Parkmore Family Dental today for urgent care or same-day appointments.
Our experienced team provides:
We proudly support patients across Keysborough and the greater Melbourne area.
