Symptom guide
Tooth Sensitivity: Why It Happens & What Actually Helps
That electric wince when cold water hits a tooth is one of dentistry's most common complaints — and one of the most misunderstood. Sensitivity is a symptom, not a diagnosis; the fix depends entirely on why the protective layers of your tooth stopped doing their job.
Medically reviewed by Dr. Vernica Agarwala, Cosmetic dentistry specialist
Understanding it
What's actually happening
Healthy teeth are insulated: enamel covers the crown, gums cover the root. Underneath both lies dentine — a layer packed with microscopic fluid-filled tubes that run straight to the nerve. When enamel wears thin or gums recede, those tubes are exposed, and hot, cold, sweet or even a breath of air moves the fluid — which the nerve reads as a sharp jolt.
The pattern tells the story. Many teeth mildly sensitive to cold usually means generalised enamel wear or recession. One tooth suddenly sensitive — especially if it lingers after the trigger is gone or hurts on biting — suggests a specific problem: a crack, deep decay or a failing filling that needs individual attention.
Common causes
What's usually behind tooth sensitivity
Enamel erosion
Acidic drinks (colas, citrus, wine) and acid reflux dissolve enamel gradually — the most common modern cause.
Aggressive brushing
Hard bristles and heavy scrubbing wear enamel and push gums back, exposing root surfaces.
Gum recession
Receded gums expose root dentine, which has no enamel covering at all.
Teeth grinding
Clenching and grinding flex and wear teeth, opening dentine tubules — often with morning jaw ache.
Whitening overuse
Unsupervised or too-frequent whitening temporarily opens tubules — one reason supervision matters.
A cracked tooth or deep decay
Single-tooth sensitivity, or pain that lingers, is a different problem needing an examination.
Your action plan
What helps at home — and what shouldn't wait
Home care that genuinely helps
- Switch to a desensitising toothpaste and use it consistently — it takes 2–4 weeks to build its effect
- Use a soft-bristled brush with gentle pressure; hold it like a pen, not a hammer
- Don't brush immediately after acidic food or drink — rinse with water and wait 30 minutes
- Cut down acidic drinks, or use a straw so they bypass your teeth
- Avoid whitening products until the sensitivity is understood
- A smear of desensitising toothpaste rubbed on the worst spot before bed helps overnight
See a dentist if…
- Sensitivity concentrated in one tooth
- Pain that lingers for more than 30 seconds after the trigger is gone
- Pain on biting or releasing — the classic cracked-tooth sign
- Sensitivity with a visible hole, dark spot or chipped edge
- Gums receding visibly, or sensitivity worsening month on month
Severe swelling, fever or trouble swallowing? Read the emergency guide and call us now.
At the studio
How we treat it
We first separate general wear from a specific problem — examination plus an X-ray where needed. Generalised sensitivity responds to professional fluoride or desensitising treatment, a corrected brushing technique and, where grinding is the driver, a night guard. A cracked or decayed tooth gets fixed directly, which ends that sensitivity for good.
Straight answers
Tooth Sensitivity — your questions, answered
Fresh onset usually means newly exposed dentine — from enamel erosion, gum recession, grinding, or a new crack or cavity. Sudden single-tooth sensitivity in particular deserves an examination rather than just sensitivity toothpaste.
Keep reading
This guide is educational and doesn't replace an examination. Medically reviewed by Dr. Vernica Agarwala — last updated July 2026.
Dealing with tooth sensitivity?
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