What Is Tooth Sensitivity?

Tooth sensitivity is a sharp, sudden pain in one or more teeth triggered by hot, cold, sweet, or acidic foods and drinks, or cold air. The clinical term for this dental condition is dentin hypersensitivity.

Tooth anatomy explains this physical reaction. Enamel forms the hard outer shell of the visible tooth crown and protects the dentin layer beneath it. Dentin contains thousands of microscopic tubules leading directly to the tooth nerve, known as the dental pulp. Enamel wears away or gums recede over time due to dietary acids or mechanical friction. This physical exposure leaves the dentin tubules completely unprotected. Temperature changes and chemical stimuli travel rapidly through these open tubules directly to the nerve, causing acute pain.

According to Australian Dental Association guidelines on dentin hypersensitivity, this condition affects approximately 1 in 3 adults across the country. The clinical team at Ferny Hills Dental diagnoses and treats this nerve response daily for patients in Ferny Hills, Ferny Grove, Everton Park, Everton Hills, Gaythorne, Keperra, Arana Hills, and Upper Kedron. Scheduling regular preventative dentistry appointments allows our dentists to monitor enamel thickness and prevent severe hypersensitivity.

What Causes Sensitive Teeth?

Sensitive teeth occur when 8 specific factors compromise the protective enamel layer or expose the underlying tooth root. The underlying causes range from dietary habits to physical tooth damage.

1. Consume acidic foods and drinks: Citrus fruits, tomatoes, sports drinks, and carbonated soft drinks lower the pH level in the oral cavity. This high acidity erodes the calcium and phosphate minerals composing the tooth enamel. Thinning enamel directly exposes the underlying dentin layer to external temperature changes.
2. Experience receding gums: Periodontal disease or chronic aggressive brushing causes gum tissue to pull away from the teeth. Gum recession exposes the cementum covering the tooth root surface. Cementum is highly porous and wears away quickly, leaving the root dentin completely unprotected.
3. Develop tooth decay: Dental caries create physical holes in the enamel structure. Oral bacteria produce acid that eats through the tooth surface. Decay reaching the dentin layer directly stimulates the tooth nerve, registering as sharp, localized sensitivity.
4. Crack or chip a tooth: Biting down on hard objects, ice cubes, or unpopped popcorn kernels generates structural fractures in the enamel. These cracks travel down to the dentin or nerve chamber. Chewing pressure opens these microscopic cracks temporarily, allowing fluid and temperatures to rush into the tooth.
5. Grind your teeth: Bruxism, or chronic teeth grinding and clenching, applies excessive horizontal force to the dental arch. This constant friction grinds down the occlusal enamel on the molars and creates micro-fractures that expose the dentin layer.
6. Receive recent dental work: Dental procedures including white fillings, CEREC crowns, or teeth whitening temporarily irritate the tooth nerve. Dental instruments and restorative materials cause acute pulp inflammation. This post-operative sensitivity resolves naturally as the nerve heals over a few weeks.
7. Overuse whitening products: Frequent application of peroxide-based whitening gels penetrates the enamel and reaches the dentin layer. The peroxide chemical oxidises stains but temporarily increases the permeability of the dentin tubules, causing intense sensitivity.
8. Brush aggressively with hard bristles: Using a hard-bristled toothbrush with excessive force mechanically scrubs away the thin enamel near the gumline. This mechanical wear accelerates gum recession and rapidly exposes the highly sensitive root surface.

Identifying the exact trigger among these 8 causes requires a professional diagnosis. Our team uses targeted examinations to isolate the specific factor causing your tooth pain from cold or hot stimuli.

What Are the Symptoms of Tooth Sensitivity?

Symptoms of tooth sensitivity include a sharp, sudden pain from hot or cold triggers, discomfort when breathing cold air, and pain when brushing with cold water. Patients frequently report a sudden, electric shock sensation in their teeth when eating ice cream, drinking hot coffee, or consuming sugary sweets.

Distinguishing between different types of dental pain determines the necessary clinical intervention. Reversible sensitivity produces a short, sharp pain that lasts for a few seconds. The pain resolves immediately after removing the trigger, such as the cold water or sweet food. In cases of reversible sensitivity, the tooth nerve remains healthy and simply reacts strongly to the exposed dentin tubules.

Irreversible pulpitis presents distinctly different symptoms. The pain lingers for more than 30 seconds after removing the temperature trigger. A dull, throbbing ache often develops spontaneously without any temperature stimulus. Lingering pain indicates permanent nerve damage. The tooth requires root canal therapy to remove the dying pulp and stop the severe pain. Patients in Brisbane north experiencing lingering pain should schedule an examination immediately to prevent a dental abscess.

How Is Tooth Sensitivity Diagnosed?

Dentists diagnose tooth sensitivity by performing a visual examination, an air blast test, a temperature test, a bite test, and taking digital X-rays. This comprehensive diagnostic approach isolates the exact tooth and identifies the underlying physical cause of the pain.

• Visual examination: Dr Angela Yang and Dr Jennifer Lee inspect the teeth for visible enamel wear, hairline cracks, and gum recession. They evaluate the gumline for exposed root surfaces and check existing restorations for marginal gaps.
• Air blast test: The dentist uses a dental syringe to blow a controlled stream of cold air onto individual teeth. A positive, painful response to the air blast indicates active dentin hypersensitivity.
• Temperature test: The dentist applies a cold cotton swab soaked in ethyl chloride or ice water directly to the suspected tooth. This clinical test confirms the nerve’s reaction time and the severity of the sensitivity.
• Bite test: The dentist asks the patient to bite down on a plastic dental instrument or a cotton roll. Pain upon releasing the bite often indicates a cracked tooth syndrome, which requires a crown or extraction.
• Digital X-rays: Radiographs reveal the internal tooth structure and surrounding jawbone. X-rays effectively rule out hidden interproximal decay, periapical abscesses, or nerve damage that require different treatments.

Attending regular check-ups and cleans allows our dentists to monitor enamel thickness and gum health over time. Early diagnosis prevents minor sensitivity from progressing into a severe dental emergency.

How Is Tooth Sensitivity Treated?

Dentists treat tooth sensitivity by using desensitising toothpaste, applying fluoride varnish, placing composite bonding, performing gum grafts, conducting root canal therapy, or fabricating a custom night splint. The specific treatment protocol depends entirely on the severity of the condition and the exact anatomical cause of the exposed dentin.

1. Use desensitising toothpaste: Dentists recommend over-the-counter sensitive teeth toothpaste. These formulations contain chemical compounds that physically block the open dentin tubules, preventing external temperature changes from reaching the tooth nerve.
2. Apply fluoride varnish: Dental professionals paint a highly concentrated fluoride gel onto the exposed root surfaces. Fluoride varnish remineralises the enamel and occludes the microscopic tubule openings. Ferny Hills Dental includes these professional fluoride treatments directly during your standard check-up.
3. Place composite bonding: For severely receded gums or deep enamel erosion, dentists apply a tooth-coloured resin over the exposed root. White fillings seal the dentin and provide a synthetic barrier against hot and cold stimuli.
4. Perform gum grafts: Periodontists surgically harvest tissue from the palate and graft it over the receded gumline. This surgical intervention permanently covers the exposed roots and halts further periodontal recession.
5. Conduct root canal therapy: When sensitivity progresses to irreversible pulpitis, the tooth nerve dies. Endodontic treatment removes the damaged nerve and pulp tissue, eliminating the pain entirely while saving the natural tooth structure.
6. Fabricate a night splint: For patients experiencing bruxism, dentists take dental impressions and create a custom acrylic mouthguard. Wearing this splint at night prevents the upper and lower arches from touching, stopping the mechanical enamel wear that causes tooth sensitivity. For extensive structural damage, crowns and bridges restore the fractured teeth.

What Does Tooth Sensitivity Treatment Cost?

Tooth sensitivity treatment costs range from $10 for over-the-counter desensitising toothpaste to $1,600 for complex root canal therapy. The final price varies based on the required dental procedure, the materials used, and the complexity of the specific tooth anatomy.

The table below details average treatment costs in Australia:

Treatment Option	Average Cost in AUD	Clinical Details
Desensitising Toothpaste	$10 – $20	Available at supermarkets and pharmacies
Fluoride Varnish	$50 – $100	Often included in standard check-up costs
Composite Bonding	$200 – $400	Price per tooth depending on surface area
Custom Night Splint	$400 – $600	Laboratory fabricated acrylic appliance
Root Canal Therapy	$900 – $1,600	Price depends on the number of root canals

Ferny Hills Dental is a preferred provider for both Medibank and Bupa. Patients with these health funds receive higher rebates and significantly reduced out-of-pocket costs for major treatments like composite bonding, night splints, and CEREC crowns. We recommend reviewing your specific private health insurance coverage before commencing extensive clinical treatments.

What Is the Best Toothpaste for Sensitive Teeth?

The best toothpaste for sensitive teeth contains active ingredients like potassium nitrate, arginine, or stannous fluoride. These specific chemical compounds target the nerve endings or physically block the dentin tubules to interrupt pain signals.

• Sensodyne: This brand uses potassium nitrate as its primary active ingredient. Potassium nitrate depolarises the tooth nerve fibres. By calming the nerve endings inside the dental pulp, this compound prevents the nerve from firing pain signals when exposed to cold temperatures.
• Colgate Sensitive Pro Relief: This formulation relies on arginine and calcium carbonate. These ingredients interact with saliva to create a robust physical plug inside the open dentin tubules. This mineralised calcium barrier stops fluid shifts within the tubules that typically trigger nerve pain.
• Oral-B Sensitivity: This product uses stannous fluoride. Unlike standard sodium fluoride found in regular toothpaste, stannous fluoride remineralises the enamel and deposits a protective smear layer over the exposed dentin surface. It physically blocks the tubule openings while providing robust anti-cavity protection.

Patients must apply these therapeutic toothpastes twice daily. The chemical barrier requires approximately two to four weeks of consistent use to build up sufficiently and produce a noticeable reduction in pain. Spitting out the excess toothpaste without rinsing with water afterwards leaves the active ingredients on the teeth longer, accelerating the desensitising process.

What Happens If You Ignore Tooth Sensitivity?

Ignoring tooth sensitivity leads to worsening underlying conditions, increased structural tooth damage, and the eventual need for complex dental treatments. The sharp pain acts as a mechanical warning signal indicating an open pathway to the tooth nerve.

Untreated tooth decay deepens over time. Oral bacteria continue dissolving the enamel and dentin until they physically breach the pulp chamber. This direct bacterial invasion causes a severe, painful infection known as a dental abscess, requiring immediate root canal therapy or tooth extraction.

Cracked teeth deteriorate rapidly under constant chewing pressure. Hairline fractures propagate down toward the tooth root. Bacteria colonise the internal fracture line, causing internal inflammation and destroying the supporting jawbone.

Advanced gum disease destroys the alveolar bone supporting the teeth. Ignoring the sensitivity caused by receding gums allows periodontal disease to progress unchecked. Teeth lose their bony foundation and eventually become mobile. Attending regular preventative dentistry appointments allows Dr Neil Haldar and Dr Rochelle Yong Gee to intervene early, halting this destructive cycle before complex surgery becomes necessary.

When Is Tooth Sensitivity a Dental Emergency?

Tooth sensitivity is a dental emergency when you experience sudden severe sensitivity in one tooth, pain that lingers more than 30 seconds, pain after physical trauma, or sensitivity accompanied by facial swelling. Standard dentin hypersensitivity causes brief, manageable discomfort. Emergency conditions cause debilitating, constant pain.

A severe, throbbing ache that wakes you up at night indicates a dying nerve or an advanced periapical abscess. Swelling in the gums, cheek, or jaw signals a spreading bacterial infection that requires immediate clinical intervention, antibiotic therapy, and surgical drainage.

Sudden tooth pain following a sports injury, physical accident, or sudden fall indicates potential structural damage. The physical impact might have fractured the tooth root or severed the internal blood supply to the dental pulp. Immediate intervention stabilises the remaining tooth structure. Patients in Ferny Hills and surrounding Brisbane north suburbs experiencing these severe symptoms must call Ferny Hills Dental immediately at (07) 3351 2731.

How Can You Prevent Tooth Sensitivity?

You can prevent tooth sensitivity by using a soft toothbrush, brushing gently, limiting acidic foods, using desensitising toothpaste, wearing a night splint, waiting 30 minutes after eating before brushing, and attending regular dental visits. Proactive oral hygiene protocols stop enamel loss and prevent gum recession.

1. Choose a soft toothbrush: Soft or extra-soft nylon bristles clean the teeth effectively without mechanically abrading the enamel surface. Discard medium and hard bristle brushes permanently to protect your gumline.
2. Brush gently: Apply minimal pressure during your daily hygiene routine. Brushing too hard destroys the delicate gingival tissue and causes rapid gingival recession. Hold the brush at a 45-degree angle and use gentle circular motions.
3. Limit acidic foods and drinks: Reduce your daily intake of soft drinks, citrus fruit juices, and vinegar-based dressings. Dietary acids demineralise the enamel surface and directly expose the sensitive dentin layer.
4. Use desensitising toothpaste: Daily use of therapeutic toothpaste containing potassium nitrate or stannous fluoride maintains a constant protective barrier over the microscopic dentin tubules.
5. Wear a night splint: Custom mouthguards fabricated by our clinical team prevent the destructive shearing forces of nocturnal bruxism. A properly fitted splint protects the occlusal enamel from physical wear.
6. Wait 30 minutes after acidic food: Acidic foods temporarily soften the enamel surface. Brushing immediately after acid exposure physically scrubs away the softened enamel matrix. Waiting 30 minutes allows your saliva to neutralise the acid and remineralise the enamel before brushing.
7. Attend regular check-ups: Professional scale and clean appointments remove hardened dental calculus that harbours decay-causing bacteria. Routine clinical examinations detect early enamel wear and structural cracks before hypersensitivity develops.

Frequently Asked Questions

Can tooth sensitivity go away on its own?
Yes, tooth sensitivity from recent dental work or temporary minor enamel exposure can go away on its own within a few weeks. Sensitivity from structural damage, deep decay, or severe gum recession requires professional clinical treatment to resolve the pain permanently.

Why are my teeth suddenly sensitive?
Teeth become suddenly sensitive due to exposed dentin from rapidly receding gums, a newly formed crack in the tooth enamel, or underlying dental decay. A sudden localized reaction to cold temperatures on a single tooth often indicates a cracked tooth or a deep cavity requiring a clinical examination.

How long does tooth sensitivity last after a filling?
Tooth sensitivity lasts for 1 to 2 weeks after a routine dental filling. The nerve inside the tooth requires time to recover from the physical drilling and the placement of the restorative material. Pain that worsens or persists beyond four weeks indicates a compromised nerve requiring endodontic evaluation.

What is the fastest way to stop tooth sensitivity?
The fastest way to stop tooth sensitivity is applying a highly concentrated fluoride varnish or a desensitising agent at a dental clinic. This professional treatment physically seals the exposed dentin tubules immediately. Using over-the-counter sensitive teeth toothpaste provides noticeable relief within 2 to 4 weeks of consistent daily use.

Is tooth sensitivity a sign of a cavity?
Yes, tooth sensitivity is a common early symptom of a dental cavity. Active tooth decay destroys the hard outer enamel layer and reaches the softer underlying dentin. This physical structural damage exposes the microscopic tubules inside the dentin to temperature changes, sweet foods, and oral bacteria, triggering sharp pain.

Can teeth whitening cause permanent sensitivity?
No, professional teeth whitening does not cause permanent tooth sensitivity. Whitening gels containing hydrogen peroxide or carbamide peroxide temporarily increase the porosity of the enamel and slightly dehydrate the teeth. This reversible chemical process causes acute sensitivity that resolves completely within 24 to 48 hours after the whitening treatment concludes.

Last reviewed: July 2026 by Dr Angela Yang, BDS (Distinction), University of Otago 2006, AHPRA DEN0001309836. The clinical team at Ferny Hills Dental brings together graduates of the University of Otago and University of Queensland with over 50 years of combined clinical experience. Ferny Hills Dental is a Medibank Members Choice and Bupa Members First preferred provider.