Tooth sensitivity is one of the most common concerns people bring to the dentist. It can show up as a sharp pain when you eat something cold, sweet, or acidic, or even when you breathe in cool air. Understanding what causes tooth sensitivity is the first step to finding the right approach for your situation.
At Beyond Infinity Dental, we offer dental care in Castle Hill and take time to understand what is driving your discomfort before recommending any treatment.
Quick Overview
- Tooth sensitivity is discomfort or sharp pain triggered by temperature, sweet foods, or acidic foods, often linked to exposed dentin or worn enamel
- It may affect adults of any age and can develop gradually or appear after a specific dental change
- Identifying the underlying cause can help guide options such as desensitising toothpaste, changes to brushing habits, or dental treatment
- The cause, severity, and duration of sensitivity all affect which approach may be suitable for your situation
- A dental assessment helps identify whether sensitivity is linked to enamel wear, gum recession, a cracked tooth, or another factor
The sections below outline the main causes, contributing factors, and what a dentist may explore during an assessment.
What Causes Tooth Sensitivity?
Tooth sensitivity, known clinically as dentin hypersensitivity, occurs when the inner layer of your tooth, called dentin, becomes exposed. Dentin contains tiny channels that connect to the nerve. When something cold, hot, sweet, or acidic reaches those channels, it can trigger a sharp, sudden pain.
The outer layer of your tooth, the enamel, normally protects the dentin above the gumline. Below the gumline, the root surfaces are covered by a layer called cementum. When either of these protective layers is lost or worn down, sensitivity can follow.
Does Enamel Wear Cause Sensitive Teeth?
Worn enamel is one of the more common reasons teeth become sensitive. Enamel wear can happen gradually over time and may be linked to:
- Brushing with a hard toothbrush or applying too much pressure
- Frequent consumption of acidic foods and citrus fruits, which can soften enamel over time
- Tooth grinding (bruxism), which places repeated force across the biting surfaces
- Tooth erosion from stomach acid, in cases such as reflux
Acidic foods and enamel loss are closely linked, with exposed root surfaces becoming sensitive to hot, cold, and sweet foods as a result. Once enamel is gone, it does not regenerate, though certain treatments may help protect what remains.
Can Gum Recession Make Teeth Hurt?
Yes. When gums pull away from the tooth, the root surfaces become exposed. Root surfaces do not have an enamel protective layer, making them more susceptible to sensitivity.
Gum recession can result from:
- Gum disease, where plaque buildup causes the gum tissue to break down
- Brushing too firmly over time
- Natural variation in gum tissue thickness
In more advanced cases, a dentist may discuss options including a gum graft to replace lost gum tissue and cover exposed root surfaces.
Other Causes of Sensitive Teeth
Sensitivity is not always caused by enamel wear or gum recession. Other factors include:
- Cracked tooth: A crack in the tooth can expose the inner layer and cause sharp pain, particularly when biting
- Tooth decay or a cavity: Decay can break down the enamel and reach the dentin
- A worn filling: A filling that has deteriorated may no longer protect the tooth adequately
- Recent dental treatment: Some people notice temporary sensitivity after whitening, cleaning, or other procedures; this typically settles over time
Because several different issues can cause similar symptoms, identifying the underlying cause matters before selecting a treatment approach.
Managing and Treating Tooth Sensitivity
The right approach depends on the cause. Some options a dentist may discuss include:
- Desensitising toothpaste: These products contain compounds that can help block the channels in exposed dentin over time
- Switching to a soft-bristled toothbrush: Reducing pressure on the enamel and gums during brushing
- Fluoride treatments: Applied in-clinic, fluoride can help strengthen tooth enamel and reduce discomfort from exposed dentin
- Addressing the underlying cause: Treating decay, replacing a worn filling, or discussing options for gum recession
Seeing your dentist regularly so that changes such as tooth decay and sensitivity can be identified and addressed early.
A Considered Approach to Tooth Sensitivity
Tooth sensitivity can range from mild and occasional to frequent and disruptive. It is worth discussing with a dentist, as the cause is not always obvious and can involve more than one contributing factor. Individual outcomes vary depending on the underlying cause, the extent of any enamel wear or gum changes, and the treatment approach that suits your situation.
If you have noticed increased sensitivity or teeth that hurt with temperature or certain foods, we welcome you to contact Beyond Infinity Dental or book an appointment today. You can also call the team directly on (02) 8806 3799.
Frequently Asked Questions
Can tooth grinding make teeth sensitive?
Tooth grinding (bruxism) places repeated pressure across the biting surfaces, which can wear down enamel over time and make teeth more susceptible to sensitivity. Many people grind their teeth during sleep without being aware of it. A dentist can check for signs of grinding and discuss whether a protective mouthguard may be appropriate for your situation.
Can sensitive teeth go away on their own?
In some cases, mild sensitivity linked to a temporary trigger, such as a recent scale and clean or a short-term dietary change, may settle without treatment. Sensitivity that persists, worsens, or appears without an obvious cause is worth having assessed. It may indicate an underlying issue, such as decay or gum changes, that is unlikely to resolve without some form of management.
References
Department of Health & Human Services. (n.d., reviewed 22 October 2025). ‘Dental erosion’. Better Health Channel. Melbourne, VIC: Department of Health, State Government of Victoria. https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/dental-erosion
Healthdirect Australia. (2024). ‘Dental care and teeth cleaning’. Healthdirect, November. Australia: Healthdirect Australia. https://www.healthdirect.gov.au/teeth-cleaning
