What reaction is typical?
Exposed dentine can respond to cold, touch or other stimuli with brief, sharp pain. However, similar symptoms have other possible causes.
← All explanationsDentine hypersensitivity
Why does cold water sometimes cause a sharp pain?
Dentine hypersensitivity is one possible cause of brief, sharp reactions to cold, touch or other stimuli. Dentine is often exposed. Similar symptoms can also result from decay, cracks or other conditions. The cause therefore needs assessment.
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A brief stimulus can cause a sharp pain
Exposed dentine can respond to cold or touch with brief, sharp pain. These symptoms are also called dentine hypersensitivity.
Fine tubules transmit stimuli
Dentine contains fluid-filled tubules. A leading explanation is that stimuli move this fluid and activate nerves inside the tooth. The illustration is highly simplified.
Cold sensitivity is not a clear diagnosis
Decay, cracks and other causes can produce similar symptoms. New or recurring symptoms warrant an examination. Persistent or spontaneous pain should be assessed promptly.
At a glance
How does the sensitivity arise?
A leading explanation involves fluid movement in fine dentinal tubules. This can allow nerves inside the tooth to respond to external stimuli.
Why is an examination important?
Decay, cracks or other conditions can produce similar symptoms. Persistent or spontaneous pain should be assessed promptly.
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Often confused
Dentine hypersensitivity or another cause?
Dentine hypersensitivity describes stimulus-related symptoms from exposed dentine that are not better explained by another dental condition. This is assessed by a dentist.
Quick answers
Does every reaction to cold mean dentine hypersensitivity?
No. Other dental problems can also respond to cold. Location, duration and triggers help the discussion, but do not replace an examination.
Can toothpaste for sensitive teeth help?
These products can reduce symptoms, but do not work equally for every cause. Persistent symptoms call for an assessment of the cause.
What information helps at the appointment?
Note which tooth seems affected, what triggers the pain and how long it lasts. Mention any spontaneous pain or swelling too.
At the practice
For your consultation
A question to discuss with Dr. med. dent. Niusha Barahmand Pour:
Which cause fits my triggers and the duration of my symptoms, and what should be checked first?
Personal discussion, examination and clear treatment planning go together at the practice.
An examination can distinguish sensitive exposed dentine from other possible causes of the symptoms.
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Build on the simple explanation with clinical terms, key distinctions and a knowledge question.
- Dentinal hypersensitivity
- Brief, sharp pain from a stimulus acting on exposed dentine, not better explained by another dental condition.
- Hydrodynamic theory
- Stimuli move fluid within dentinal tubules and can thereby activate nerves inside the tooth.
- Differential diagnosis
- Distinguishing possible causes of similar symptoms through history-taking and examination.
Know the difference
Cold sensitivity is a symptom. Dentine hypersensitivity is assessed after other plausible causes have been checked.
Sources and context
Editorial research: 22 October 2026. This explanation covers general principles and does not replace a personal examination. Suitable treatment is discussed following individual assessment.