Tooth pain can be difficult to read. What starts as a dull ache can shift to something sharper, or linger in a way that makes it hard to ignore. Two of the more common causes of dental pain are tooth infection and tooth nerve pain. They can feel surprisingly similar, yet they stem from different sources and often need different care.
Knowing what to look for can help you take the right next step. If you are experiencing dental pain that concerns you, our emergency toothache treatment Stanhope Gardens page has information on when to seek same-day care.
At Finesse Dental in Stanhope Gardens, our team takes the time to assess pain thoroughly before recommending any treatment path.
Quick Overview
- Tooth infections involve bacteria entering the inner tooth or surrounding tissue and typically cause constant, throbbing pain with visible swelling
- Tooth nerve pain involves irritation or inflammation of the dental pulp and tends to feel sharp or shooting, often triggered by temperature or pressure
- Both conditions can worsen if left untreated and require a dental assessment to identify the underlying cause
- A clinical examination and dental X-rays are usually needed before any treatment path is recommended
- The severity, duration, and accompanying symptoms all affect how a dentist will investigate and manage the issue
Keep reading to understand how these two types of tooth pain differ and what signs are worth acting on quickly.
What Is a Tooth Infection?
A tooth infection, also called a dental abscess, occurs when bacteria enter the inner layers of the tooth or the surrounding gum tissue. This typically happens when decay, a crack, or gum disease creates a pathway for bacteria to reach the dental pulp. The body responds by producing pus, which builds up inside the tooth or at the root.
Common signs of a tooth infection include:
- Persistent, throbbing pain near the affected tooth
- Visible swelling of the gum, cheek, or jaw
- A bad taste in the mouth or bad breath
- Fever or swollen lymph nodes near the jaw
- Sensitivity when biting or applying pressure to the tooth
The pain from an infection tends to be constant. It often intensifies when lying down, as increased blood flow to the head can raise pressure around the affected tooth.
What Is Tooth Nerve Pain?
Tooth nerve pain, often described clinically as pulpitis, refers to inflammation or irritation of the dental pulp. The pulp is the soft tissue at the centre of each tooth, containing nerves and blood vessels. The pulp can become inflamed due to deep decay, tooth cracks, trauma, or excessive wear from teeth grinding.
There are two categories:
- Reversible pulpitis: Early-stage inflammation where the pulp can recover if the underlying cause (such as decay) is treated promptly
- Irreversible pulpitis: More advanced inflammation where the pulp cannot recover, often requiring root canal treatment or extraction
Nerve pain often feels sharp or shooting and is typically triggered by specific stimuli: cold drinks, hot food, sweet foods, or pressure from biting. If the sensation fades within a few seconds of removing the trigger, this may suggest the pulp is still in a reversible stage. If sensitivity lingers for minutes after the trigger is removed, the situation may be more advanced.
Key Differences Between a Tooth Infection and Nerve Pain
While both conditions can cause significant discomfort, a few patterns help distinguish them.
Infection pain is typically constant and throbbing, and does not require a trigger. It often comes with visible swelling of the gum, cheek, or jaw, and may be accompanied by fever or swollen lymph nodes. A bad taste in the mouth is also more commonly linked to infection.
Nerve pain, by contrast, is usually sharp and short-lived, appearing in response to cold, heat, sweet foods, or pressure. It rarely causes visible swelling and is not typically associated with fever.
One clinically important distinction: if a tooth that was painful suddenly stops hurting, this does not always mean the problem has resolved. In some cases, it may indicate that the nerve tissue has died. The infection may still be present and progressing without pain as a signal.
How Do Dentists Identify the Cause of Tooth Pain?
Dentists do not rely on symptoms alone. A thorough assessment typically includes:
- Clinical examination: Checking for visible swelling, gum changes, or signs of decay around the affected tooth
- Percussion testing: Gently tapping the tooth to assess whether pain is present with pressure
- Temperature sensitivity testing: Applying hot or cold stimuli to determine how the pulp responds and how long sensitivity lasts
- Dental X-rays: Imaging to detect bone changes, abscess formation, or the extent of decay around the tooth root
Individual outcomes depend on the severity of the condition at the time of assessment. Early intervention generally allows for more conservative treatment options.
A Considered Approach to Tooth Pain
Tooth pain of any kind is worth investigating. Whether the cause is an early-stage infection, nerve irritation, or something else entirely, understanding the source is the first step toward managing it appropriately.
If you are experiencing persistent tooth pain, swelling, a bad taste in the mouth, or sensitivity that does not settle, we welcome you to call Finesse Dental Stanhope Gardens. Our team can assess your symptoms and discuss what options may be suitable for your situation.
Call us on (02) 8806 0790 or book an appointment online.
Frequently Asked Questions
Is it possible to have a tooth infection with no pain?
Yes, and this is one reason pain alone is not a reliable guide to treatment urgency. In some cases, as the dental pulp dies, the nerve stops sending pain signals, so discomfort may actually reduce or disappear. The infection can still be present and progressing. A dentist may detect an abscess on X-ray even when a patient reports no current pain, which is one reason regular check-ups matter, regardless of how a tooth feels day to day.
Can teeth grinding cause nerve pain?
It can contribute to it. Grinding (bruxism) gradually wears down tooth enamel, which exposes the dentin layer underneath. Dentin is more sensitive to temperature and pressure, and persistent grinding can eventually irritate the dental pulp. Excessive wear of the outer tooth layers is one recognised pathway to pulp inflammation. A dentist can assess whether a mouthguard or other protective measure may be appropriate for your situation.
Note: Any surgical or invasive procedure carries risks. Before proceeding, you should seek a second opinion from an appropriately qualified health practitioner.
References
Healthdirect Australia. (2025). ‘Tooth abscess’. Healthdirect Australia, 18 December. Sydney, NSW: Healthdirect Australia. https://www.healthdirect.gov.au/tooth-abscess
Department of Health and Human Services. (2006, updated n.d.). ‘Root canal treatment’. Better Health Channel. Melbourne, VIC: Department of Health and Human Services, Victoria. https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/root-canal-treatment
Healthdirect Australia. (2025). ‘Root canal treatment’. Healthdirect Australia, 1 October. Sydney, NSW: Healthdirect Australia. https://www.healthdirect.gov.au/root-canal-treatment