Tooth sensitivity: why do your teeth react to cold?

You drink a glass of cold water and a sharp pain shoots through your tooth?
This very common phenomenon is called dentine hypersensitivity. As a dental clinic in Montreal, we receive patients every week who describe these symptoms.

Understanding the cause is essential, because a sensitive tooth never happens by chance.

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The most common causes of cold sensitivity

1. Enamel wear

Enamel is the tooth's protective layer. When it thins, dentin becomes exposed and cold reaches the nerves more easily.
Why does enamel wear?

• Brushing too vigorously
• Abrasive toothpastes
• Bruxism (teeth grinding)
• Acidic food (energy drinks, lemon, vinegar)

2. Retracted gums

When the gums recede, the root of the tooth - naturally more sensitive - becomes exposed.
This can be related to :

• Gum disease
• Brushing too hard
• Poor brushing technique
• Age

3. A cavity or crack

Localized pain when cold is often a sign :

• incipient caries,
• an old, leaking filling,
• or a microscopic crack in the tooth.

4. Recent dental treatments

After a deep cleaning, filling or whitening, teeth may be temporarily sensitive. This should normally subside within a few days.

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How serious is it? When should I seek medical advice?

You should consult a dentist in Montreal if :

• the pain comes back every day,
• sensitivity increases,
• it affects a single tooth in particular,
• there's a sudden cold shock rather than diffuse discomfort.

The earlier the cause is identified, the simpler the treatment.

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Solutions to reduce or eliminate tooth sensitivity

At Clinique dentaire Fullum, we offer several approaches depending on the cause.

1. Desensitizing toothpastes

They work by blocking the channels leading to the tooth's nerve.

2. Fluoride varnishes or desensitizers in clinical use

Quick application, very effective in reducing sensitivity.

3. Brushing correction

We show patients a gentle, effective technique for protecting enamel and gums.

4. Gum treatments

If sensitivity is linked to gingival recession or gingivitis, targeted treatment can make all the difference.

5. Dental restorations

In the case of cracks, cavities or defective fillings, repairs can eliminate the cause at source.

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How can you prevent tooth sensitivity?

• Brush with a soft brush
• Use a non-abrasive toothpaste
• Limit acidic foods
• Avoid clenching or grinding your teeth (a mouthpiece can help)
• Consult regularly for professional cleaning

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Need to assess your dental sensitivity?

If you experience even mild cold pain, a quick examination can identify the cause and prevent it from getting worse.

Clinique dentaire Fullum - Dentiste Montréal
We welcome new patients and offer personalized care for sensitive teeth.

Book your appointment online or contact us today.