Question: What causes severe sensitivity to cold and when is it serious?
Explanation: Cold sensitivity arises when stimuli reach the pulp through exposed dentine tubules. Common causes include gum recession exposing root surfaces, enamel erosion from acidic drinks, a cracked tooth, a leaking filling, or decay. The duration of the pain is the diagnostic key. Sharp pain that vanishes within a second or two of removing the cold suggests reversible pulpitis or dentine hypersensitivity, both manageable. Pain that lingers for 30 seconds or more, or occurs spontaneously, indicates irreversible pulpitis and probably root canal treatment.
Related Questions:
How can I tell harmless sensitivity from a dying nerve?
Time the pain. Reversible sensitivity stops almost immediately when the cold stimulus is removed. Irreversible pulpitis produces lingering pain, often building rather than fading, and frequently occurs spontaneously without any trigger. Any pain waking you at night is a red flag.
Do sensitive toothpastes actually work?
Yes, for dentine hypersensitivity. Potassium nitrate formulations calm the nerve response, while stannous fluoride and arginine-based pastes physically occlude the dentine tubules. They take two to four weeks of consistent use. They do not treat decay, cracks, or a dying pulp.
Why is my sensitivity worse in winter?
Cold air drawn over exposed dentine, particularly at the gum line of receded teeth, triggers the same hydrodynamic response as a cold drink. Breathing through the nose and using a desensitising toothpaste helps. Persistent worsening should still be examined for underlying causes.
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