Reviewed by Dr. Amanda Murphy, DMD — August 10, 2026
That sharp jolt from ice water, a cold breeze, or a bite of something sweet usually means the softer inner layer of a tooth — the dentin — is getting stimulation it is normally shielded from. Sensitivity is one of the most common complaints we hear at Winnetka Dental Group, and the honest news is twofold: much of it is manageable with simple changes, and some of it is a tooth asking for attention. The pattern tells us which is which.
What’s actually happening
Enamel covers the crown of each tooth; gum tissue and a thin layer called cementum cover the roots. Underneath both sits dentin, which is laced with microscopic channels that lead toward the tooth’s nerve. When enamel thins or gums recede, those channels are exposed — and temperature, sweetness, and touch suddenly have a direct line inward.
So the real question behind sensitivity is: what uncovered the dentin?
The usual suspects
- Gum recession. The most common cause. Roots have no enamel, so even a little recession can expose surfaces that feel cold acutely. Aggressive brushing, gum disease, and grinding can all contribute.
- Enamel wear. Acidic drinks (sparkling water counts a little; sports drinks and soda count a lot), reflux, and heavy-handed brushing all thin enamel over time.
- Grinding and clenching. Heavy nighttime forces flex and wear teeth, and can leave them broadly cold-sensitive — often worst in the morning. More on this in Teeth Grinding and Night Guards.
- Whitening. Temporary sensitivity during whitening is common and typically settles after treatment pauses or ends.
- A cavity or an aging filling. Decay and leaking restorations can both read as sensitivity — especially to sweets — before anything shows to the eye. See Small Cavity: Fill It or Watch It?
- A cracked tooth. Classic signature: a zing on biting or releasing, often on one specific tooth. This one should not wait.
What helps at home
If sensitivity is mild, spread across several teeth, and not getting worse, two to four weeks of consistent care is a reasonable first step:
- Switch to a toothpaste for sensitive teeth and use it consistently — the active ingredients need daily contact over weeks to build up their effect, and rinsing less aggressively after brushing helps them stay put.
- Soften your technique. A soft brush, light pressure, angled along the gumline. Scrubbing harder does not clean better; it wears more.
- Mind the acid. Keep acidic drinks with meals rather than sipping all day, and wait a while after them before brushing — enamel is temporarily softened by acid, and brushing right away wears it faster.
If a few weeks of this genuinely helps, you have your answer. Keep it up, and mention it at your next checkup so we can watch the exposed areas.
When sensitivity deserves an exam
Book a visit rather than waiting it out when:
- Sensitivity is localized to one tooth — generalized sensitivity is usually a surface story; one-tooth sensitivity is often a specific problem
- It lingers after the trigger is gone — a jolt that fades in seconds is different from an ache that hangs on
- It hurts to bite or chew
- It is getting worse despite good home care
- You can see recession, notches at the gumline, or a chipped or darkened tooth
At the exam we look at the pattern — which teeth, which triggers, how long — along with your gums, your bite, and imaging only when it would change what we do. Sensitivity has many possible sources, and the fix ranges from a desensitizing varnish to a small filling to simply adjusting how a tooth meets its neighbor. You will see what we see and understand the why before anything is treated; that is how visits work here.
Common questions from patients
Why are my teeth suddenly sensitive to cold?
Most often because dentin has become exposed — usually through gum recession or enamel wear — or because a specific tooth has developed a problem such as decay, a failing filling, or a crack. Broad, mild cold sensitivity across many teeth tends to be a surface issue; sudden or one-tooth sensitivity deserves an exam.
Does sensitivity mean I have a cavity?
Not usually — but it can. Decay and leaking fillings often announce themselves as sensitivity to sweets or cold before anything is visible. That is one reason persistent sensitivity is worth an exam rather than months of guessing.
Do sensitivity toothpastes actually work?
For many people, yes — with a catch: they work gradually, over weeks of consistent daily use, not overnight. If a month of consistent use has not helped, stop experimenting and let us look.
Can whitening cause sensitivity?
Yes, temporarily — it is the most common side effect and typically settles once treatment pauses or finishes. If you are prone to it, tell us before whitening; adjusting the schedule and using desensitizing products around treatment usually keeps it manageable.
Why does one tooth zing when I bite down?
Pain on biting or on release — especially on one tooth — is the classic pattern of a cracked tooth, though a failing filling can behave the same way. This is one to have examined promptly; cracks are far more treatable early.
What will the dentist do for sensitive teeth?
First, find the cause — pattern, gums, bite, and targeted imaging if needed. Treatment matches the finding: professional desensitizing treatments and home-care changes for exposed surfaces, a filling for decay, bite adjustment or a night guard for force problems. If it is simple, we will tell you it is simple.
Tired of wincing at ice water?
Bring us the pattern — we will find the why. Request an appointment or call or text (847) 441-5939. Winnetka Dental Group, 715 Elm St, Winnetka, IL 60093 — caring for North Shore smiles since 1988.
Related reading: Teeth Grinding and Night Guards · Small Cavity: Fill It or Watch It? · General dentistry at WDG
This information is general education, not a diagnosis.
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