Sensitive Teeth: Why Cold Drinks Make You Wince (and What Helps)
It's a hot afternoon. You finally get that ice-cold drink or a snow cone piled high with syrup, take the first bite, and... zing. A sharp little jolt shoots through a tooth, and you're suddenly chewing on one side like a secret agent.
Sound familiar? Sensitive teeth are very common, and they can usually be calmed down with the right care.
What are sensitive teeth?
Dentists call it dentine hypersensitivity. Your tooth has a hard outer shell (enamel on the top, and a thin covering on the root). Under that is dentine, a layer full of tiny tubes that lead toward the nerve.
When enamel wears thin or gums pull back, the dentine is left exposed. Cold, sweet, sour or even a puff of air makes the fluid inside those tubes move, and the nerve reacts. The result is a short, sharp pain that fades quickly once the trigger is gone.
Why does it happen?
Common causes include:
Gum recession, where the gums pull back and expose the root.
Acid wear (erosion) from soft drinks, sports drinks, citrus and sour snacks, or stomach acid from reflux.
Brushing too hard or with a hard-bristled brush.
Grinding or clenching, which wears enamel down. Our teeth grinding article explains how.
Teeth whitening, which can cause temporary sensitivity. Read more in our guide to teeth whitening.
Cracked teeth, cavities or worn fillings, which can look and feel a lot like simple sensitivity.
Recent dental work, like a new filling or deep cleaning. Tell your dentist if it doesn't settle.
What you can do at home
🟡 Use a sensitive toothpaste, the right way
Look for a toothpaste made for sensitive teeth. Common active ingredients include stannous fluoride, arginine, potassium nitrate and calcium sodium phosphosilicate. Research shows most of these do better than regular toothpaste, though results vary from person to person and the evidence for some (like potassium) is mixed.
Brush twice a day with it, every day.
Spit, don't rinse. Rinsing with water washes the active ingredients away.
For a stubborn spot, dab a little on the sensitive area at night and leave it there.
Give it time. It usually takes a few weeks of steady use to notice a real difference, and it keeps working only as long as you keep using it.
🟡 Be gentle with your brush
Use a soft-bristled brush and small, gentle circles. You're polishing, not scrubbing a pot.
🟡 Be smart with acidic drinks and snacks
You don't have to give up lime, sour fruits or your favourite drink forever. Just change how you have them:
Enjoy acidic foods and drinks with meals, not sipped all day.
Use a straw, and don't swish or hold the drink in your mouth.
Rinse with plain water afterward, or have some milk or cheese.
Wait about an hour before brushing after something acidic. Acid softens enamel for a while, and brushing too soon can scrub it away.
🟡 Protect against grinding
If your dentist confirms that you grind or clench, a custom night guard can protect your teeth from further wear while you sleep.
What your dentist may do
Your dentist will first rule out a cavity, crack or leaky filling. Treatment then depends on the cause:
Fluoride varnish or a desensitising coating painted onto the sensitive areas to seal the tiny tubes.
Bonding, a tooth-coloured material placed over exposed root surfaces or worn areas.
A gum graft to cover an exposed root when gum recession is the main problem. It is minor surgery, so it isn't the first step for everyone.
Fillings or crowns to fix decay, cracks or broken fillings.
Root canal treatment, but only when the nerve inside the tooth is inflamed or infected. It isn't used for ordinary sensitivity.
Each option has trade-offs in cost, time and how long it lasts. Coatings may need repeating, and no treatment lasts if the cause carries on.
When it's NOT just sensitivity
Simple sensitivity is a quick zing that goes away within seconds. Book a prompt visit if you notice any of these:
Pain that lingers after the cold or sweet thing is gone.
Pain that starts on its own, or throbs.
Pain that wakes you at night.
Swelling in your gum, face or jaw, or a bad taste in your mouth.
Pain when you bite down or release your bite.
One tooth that suddenly became sensitive out of nowhere.
These can point to a cavity, a crack or an inflamed nerve, which are easier to treat early. Swelling near the eye or neck, or trouble breathing or swallowing, needs emergency care right away. Not sure how urgent it is? Our article on whether it's really a dental emergency can help.
Your next step
Try a sensitive toothpaste twice daily for a few weeks, switch to a soft brush, and give your teeth a break from all-day sour sipping. If things aren't improving, or any warning signs show up, book a check-up. A quick exam can tell simple sensitivity from something that needs fixing, so you can get back to your snow cone in peace.
This article is for general education and is not a substitute for a personal dental examination. Tooth pain can have many causes, and the right treatment depends on your mouth and health history. If you have pain, swelling or concerns about your teeth, please see a dentist.
Written and reviewed by Dr. Dhanraj Budhai, Dental Surgeon/Implantologist.
About the Blogger
Dr. Dhanraj Budhai
Dental Surgeon/ Implantologist
Dr. Dhanraj Budhai has over a decade of experience, specializing in Implant Dentistry. As the founder of Smile Designers, he is dedicated to delivering state-of-the-art dental care. Outside the clinic, he enjoys photography and spending time with his cats.
"My team and I are committed to exceptional dentistry. We embrace innovation and stay at the forefront of dental advancements to ensure our patients receive the highest-quality care."
References
Canadian Advisory Board on Dentin Hypersensitivity. (2003). Consensus-based recommendations for the diagnosis and management of dentin hypersensitivity. Journal of the Canadian Dental Association, 69(4), 221–226. https://www.cda-adc.ca/jcda/vol-69/issue-4/221.pdf
Liu, X.-X., Tenenbaum, H. C., Wilder, R. S., et al. (2020). Pathogenesis, diagnosis and management of dentin hypersensitivity: an evidence-based overview for dental practitioners. BMC Oral Health, 20, 220. https://doi.org/10.1186/s12903-020-01199-z
Martins, C. C., Firmino, R. T., Riva, J. J., et al. (2020). Desensitizing toothpastes for dentin hypersensitivity: a network meta-analysis. Journal of Dental Research, 99(5), 514–522. https://doi.org/10.1177/0022034520903036
Poulsen, S., Errboe, M., Lescay Mevil, Y., & Glenny, A.-M. (2006). Potassium containing toothpastes for dentine hypersensitivity. Cochrane Database of Systematic Reviews, Issue 3, CD001476. https://doi.org/10.1002/14651858.CD001476.pub2
American Dental Association. Sensitive teeth. MouthHealthy. https://www.mouthhealthy.org/all-topics-a-z/sensitive-teeth
American Dental Association. Dietary acids and your teeth. MouthHealthy. https://www.mouthhealthy.org/all-topics-a-z/dietary-acids-and-your-teeth
American Dental Association. Teeth whitening. MouthHealthy. https://www.mouthhealthy.org/all-topics-a-z/teeth-whitening
Oral Health Foundation. Sensitive teeth. https://www.dentalhealth.org/sensitive-teeth
NHS. Toothache. https://www.nhs.uk/symptoms/toothache/
NHS. Teeth grinding (bruxism). https://www.nhs.uk/symptoms/teeth-grinding/
Dabuleanu, M. (2013). Pulpitis (reversible/irreversible). Journal of the Canadian Dental Association, 79, d90. https://jcda.ca/article/d90
