Sensitive Teeth: Why They Hurt and What to Do
Tooth sensitivity is one of the most common complaints patients mention — and one of the most frequently put up with. A sharp pain when something cold touches a tooth, a wince at the first bite of something sweet. It’s easy to adapt around it without realising how much it’s affecting daily life.
What most people don’t know is that sensitivity has a specific cause, and most causes have a specific fix.
What Is Tooth Sensitivity?
Sensitivity happens when dentine — the layer beneath the tooth’s enamel — becomes exposed. Dentine is filled with microscopic tubules that connect directly to the nerve. When these tubules are no longer insulated by enamel or gum tissue, external stimuli travel through them and reach the nerve, producing the characteristic sharp, brief pain.
Cold is the most common trigger, but heat, sweet foods, acidic foods and drinks, cold air, and sometimes direct touch can all provoke a response. The pain itself is usually short-lived — it spikes and fades — though in some cases it lingers, which is a signal that something more significant is going on.
Two things expose dentine: enamel wearing down on the crown of the tooth, or gum tissue pulling back to reveal the root surface. The root has no enamel at all — only a thin layer called cementum — making it particularly sensitive once exposed.
Common Causes
Enamel erosion
Acid dissolves enamel over time. The most common sources are dietary — soft drinks, sports drinks, citrus, vinegar-based foods — but stomach acid from reflux is a significant and often overlooked cause. Enamel doesn’t regenerate, so unchecked erosion progressively worsens sensitivity.
Gum recession
When gums pull back, root surfaces are exposed. Gum recession may result from gum disease, aggressive brushing, or genetically thin gum tissue. Root sensitivity tends to be localised and sharp.
Teeth grinding
Bruxism gradually tears away the enamel on the biting surfaces, often without the patient’s knowledge. Jaw soreness in the morning, flattened teeth, or a partner noticing grinding sounds at night are the usual first indicators. Sensitivity from grinding tends to affect multiple teeth diffusely rather than one specific spot.
Cracked tooth
A crack allows stimuli direct access to the nerve. Sensitivity from a crack is typically localised to one tooth and may also be triggered by biting pressure — not just temperature.
Worn or failing fillings
Old fillings can develop gaps at their margins, exposing the dentine underneath. Sensitivity that develops around an existing restoration, particularly an older one, is worth having assessed.
Acidic diet
Even without measurable erosion, frequent acid exposure keeps enamel temporarily softened. Sensitivity during and after eating acidic foods is common in patients with high-frequency acid contact.
Whitening products
Both professional and over-the-counter whitening products temporarily increase sensitivity by opening the pores in the enamel. This is expected and usually settles within a few days of finishing treatment.
Home Care That Helps
Desensitising toothpaste
This is the most accessible starting point and works well for mild, generalised sensitivity. Products containing potassium nitrate calm the nerve; those with stannous fluoride block the dentinal tubules.
Neither produces overnight results — consistent use over four to six weeks is needed. Applying a small amount directly to sensitive areas after brushing, rather than rinsing off, extends the effect.
Soft-bristled toothbrush
If you’re using a medium or hard brush, switch to a different one. Firm bristles wear enamel at the gumline and contribute to recession over time. Gentle circular motions clean more effectively and are less damaging than scrubbing.
Managing diet
Minimise the frequency of dietary acid exposure to reduce the risk of erosive tooth wear. After consuming something acidic, rinse with water rather than brushing immediately — enamel is temporarily softened and more vulnerable to abrasion straight after acid exposure.
Managing grinding triggers
Caffeine and alcohol both increase bruxism activity. Reducing intake is a short-term measure. A nightguard is the effective long-term solution and needs to be fitted by a dentist.
Home care helps manage mild sensitivity and slow progression. It doesn’t fix structural problems — a crack, active decay, or gum recession that’s continuing to worsen needs professional treatment.
When to See a Dentist
Some sensitivity responds well to home care. See your Cheltenham dentist if:
- Sensitivity is concentrated in one specific tooth rather than generalised across several
- Pain persists for more than 30 seconds after the trigger is withdrawn.
- Sensitivity is triggered by heat as well as cold
- Sensitivity is worsening over time rather than stable
- Pain developed or changed after recent dental work
- Sensitivity is accompanied by swelling, visible cracks, or a tooth that looks darker than those around it
Treatment Options
Fluoride varnish
Applied professionally to sensitive areas, fluoride varnish strengthens enamel and occludes exposed tubules more effectively than home fluoride—a non-invasive first step for generalised sensitivity.
Bonding agents
For localised sensitivity from enamel loss or exposed root surfaces, a bonding agent seals the exposed dentine and provides a durable physical barrier between the nerve and external stimuli.
Nightguard
A custom-fitted nightguard protects enamel from further wear during sleep. It absorbs the force of grinding rather than letting teeth take it. Combined with fluoride treatment, it can reduce bruxism-related sensitivity over time.
Gum graft
When gum recession has exposed a significant portion of the root surface and caused persistent sensitivity, a gum graft can cover the exposed area and restore the protective tissue. Recovery is generally straightforward, and results are lasting.
Treating the underlying cause
Where sensitivity is driven by decay, a crack, or a failing filling, restoring the tooth is the treatment. Fixing the structural problem removes the pathway to the nerve.
Frequently Asked Questions
Why are my teeth sensitive even though I brush regularly?
Brushing removes plaque but doesn’t protect against erosion, recession, or grinding — all common causes of sensitivity that develop regardless of brushing frequency. The cause needs to be identified before the right treatment can be recommended.
Can sensitive teeth worsen if left untreated?
Yes. Enamel erosion is progressive, recession tends to continue without treatment, and untreated decay advances toward the nerve. Sensitivity that’s worsening rather than remaining stable warrants an appointment, not more time with desensitising toothpaste.
How long does desensitising toothpaste take to work?
Four to six weeks of consistent daily use. Applying it directly to sensitive areas and leaving it on rather than rinsing improves the result. No improvement after six weeks is a signal to get a professional assessment.
Is sensitivity after whitening normal?
Yes — temporary sensitivity is a common side effect as the whitening agent opens the enamel’s pores. It typically settles within a few days. Patients with existing sensitivity should discuss this with their dentist before starting whitening.
What’s the difference between sensitivity and toothache?
Sensitivity is typically sharp, brief, and triggered by a specific stimulus—cold, heat, or sweetness. A toothache is usually a dull, persistent ache that may throb and isn’t necessarily triggered by anything external. Pain that lingers after a stimulus is removed or that wakes you at night is more consistent with a toothache and needs prompt assessment.
Sensitive Teeth Treatment in Cheltenham
If sensitivity is affecting how you eat, drink, or go about your day, it’s worth finding out what’s causing it.
At Dentist On Warrigal Cheltenham, we welcome patients from Cheltenham and nearby areas, including Mentone, Moorabbin, Highett, and Beaumaris.
Call us on (03) 9583 5506 or book online.
Visit us at Suite C, 151 Centre Dandenong Road in Cheltenham.