Tooth sensitivity to hot & cold
Sharp pain when your teeth touch hot, cold, or sweet things? Learn what causes tooth sensitivity and how to manage it.
Medically reviewed by Dr. Jose, DDS — June 9, 2026
A sharp, brief pain when your teeth encounter hot, cold, or sweet stimuli is a common complaint. It’s usually manageable, but it signals that something in your mouth needs attention.
What causes sensitivity
- Enamel wear — from acidic drinks, aggressive brushing, or grinding
- Exposed root — from gum recession (pulling back of gum tissue)
- Cracked tooth — a crack can expose the inner part of the tooth
- Cavity or decay — opens a pathway to the sensitive inner part
- Lost filling — exposes the underlying tooth
- Gum disease — inflammation and recession expose roots
Home management
Desensitizing products:
- Desensitizing toothpaste — contains compounds that block sensation from the tooth surface; use for at least 2–3 weeks for effect
- Fluoride mouthwash — strengthens enamel and can reduce sensitivity
- Fluoride gel — apply to sensitive teeth (ask your dentist for a prescription)
Behavioral changes:
- Use a soft toothbrush and brush gently (not aggressively)
- Avoid acidic drinks (soda, wine, citrus juice) — they erode enamel
- Don’t brush immediately after acidic foods — wait 30 minutes so softened enamel can re-harden
- Avoid grinding — if you grind your teeth, ask your dentist about a night guard
- Avoid whitening products — they can increase sensitivity temporarily
- Avoid acidic foods (citrus, pickles, vinegar) if you notice they trigger sensitivity
Fluoride treatment:
- Ask your dentist about a professional fluoride gel or varnish, especially if sensitivity is widespread
When to see a dentist
See a dentist if:
- Sensitivity came on suddenly — something may be wrong
- Only one tooth is sensitive — could signal a crack, cavity, or exposed root requiring treatment
- Sensitivity persists despite home care for more than a few weeks
- You have pain with a specific tooth — decay or an abscess may be developing
What NOT to do
- Don’t use acidic whitening products long-term
- Don’t brush hard in an effort to “clean” the sensitive area
- Don’t ignore sensitivity in just one tooth — could be a sign of decay or crack
What MediMouth helps with
For widespread sensitivity managed at home, desensitizing products often help. If one specific tooth is sensitive or if home care isn’t working, we can help you find a dentist for evaluation and treatment.
Frequently asked questions
Why are my teeth suddenly sensitive?
Sudden sensitivity usually comes from enamel wear, exposed roots (gum recession), a cracked tooth, a lost filling, or decay. See a dentist to find out which. Once the cause is identified, treatment can help.
How can I reduce tooth sensitivity?
Use a soft toothbrush and gentle brushing, avoid acidic foods/drinks, use fluoride mouthwash and desensitizing toothpaste, and get cavities or gum disease treated promptly. If sensitivity persists despite these steps, ask your dentist about a fluoride gel or bonded resin to seal the exposed surface.
Is sensitive teeth serious?
It's a sign that something needs attention. The underlying cause (enamel wear, decay, gum disease) can worsen if not treated, so mention it to a dentist rather than ignoring it for months on end.