· Kensington Dental Care
Why Are My Teeth Sensitive to Cold?
Cold sensitivity almost always traces back to exposed dentin — here's what exposes it and how to manage it.
That sharp zing from cold water or ice cream usually comes down to one thing: the dentin layer underneath your enamel being more exposed than it should be.
What causes the exposure
- Worn enamel from brushing too hard, grinding, or acidic foods
- Receding gums, which expose the root surface — a layer with no enamel protection at all
- Cracked teeth, which can expose dentin at the crack line
- Recent dental work (a new filling or whitening treatment), which often causes temporary sensitivity that settles within days to weeks
- Cavities, which can expose dentin directly at the site of decay
Why dentin reacts to cold
Dentin contains microscopic tubules that lead directly to the nerve inside the tooth. When it’s exposed, cold (and hot, and sometimes sweet) stimuli travel through those tubules and trigger a sharp, immediate response.
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How it’s typically managed
- Sensitivity toothpaste, used consistently, gradually blocks the tubules
- Fluoride treatments strengthen the exposed area
- A night guard, if grinding is contributing to enamel wear
- Treating the underlying cause — a cavity needs a filling, a cracked tooth needs an assessment, and so on
When to get it checked
Sensitivity that’s new, severe, or isolated to a single tooth is worth an exam rather than home management alone, since it can point to a cavity or crack that needs treatment.
Book an exam if cold sensitivity has been bothering you.
For more on this, see our general dentistry page.