- Sensitivity happens when the inner layer of your tooth (dentin) becomes exposed
- Common causes include enamel erosion, gum recession, grinding, cracked teeth, and cavities
- Treatment depends on the cause — from desensitizing toothpaste to fillings, bonding, or a nightguard
- Sensitivity is common, but it's a signal worth having checked
That sharp zing when you drink something cold. The ache after a sip of hot coffee. The discomfort from something sweet. Tooth sensitivity is incredibly common — but common doesn't mean normal. If your teeth are routinely hurting, something is going on that deserves attention. Here's what causes sensitivity and what you can do about it.
Why Do Teeth Get Sensitive?
Your tooth has multiple layers. The outer layer — enamel — is hard and protects the more sensitive dentin underneath. Dentin contains tiny tubules that connect to the nerve at the center of your tooth. When enamel wears away or gums recede, dentin becomes exposed. When exposed dentin comes in contact with temperature changes, sweets, or pressure, those tubules transmit the sensation directly to the nerve. That's the zing you feel.
Common Causes of Tooth Sensitivity
Enamel erosion. Acidic foods and drinks — citrus, soda, vinegar-based foods — wear down enamel over time. Once enamel is gone, it doesn't grow back.
Gum recession. When gum tissue pulls back from the tooth, the root surface becomes exposed. Roots don't have enamel, so they're much more sensitive. Gum recession can happen from aggressive brushing, gum disease, or simply genetics.
Teeth grinding (bruxism). Grinding wears down enamel, especially on the biting surfaces. Many people grind at night without knowing it. If you wake up with jaw soreness or your teeth look flat and worn, grinding may be the culprit.
Cracked teeth. A crack in a tooth can expose dentin or allow fluid movement that irritates the nerve. Cracks are often invisible on X-rays and can be tricky to diagnose.
Cavities. Decay removes tooth structure and can expose dentin or even reach the nerve. If sensitivity is sharp and getting worse, a cavity is one of the first things to rule out.
Recent dental work. It's normal to have some sensitivity after fillings, crowns, or whitening. This usually resolves within a few weeks.
Whitening products. Over-the-counter whitening strips and trays can cause temporary sensitivity, especially if used too frequently. Professional whitening is designed to manage this more carefully.
How Is Tooth Sensitivity Treated?
Treatment depends on what's causing it.
Desensitizing toothpaste. For mild sensitivity without an underlying problem, toothpastes containing potassium nitrate or stannous fluoride can help block the tubules in dentin over time. It takes a few weeks of consistent use to notice a difference.
Fluoride treatments. In-office fluoride can strengthen enamel and reduce sensitivity. We apply it at your cleaning appointments and can also prescribe prescription-strength fluoride for home use.
Bonding. For exposed root surfaces, we can apply a tooth-colored bonding material to cover and protect the sensitive area. It's a quick, conservative fix.
Nightguard. If grinding is causing your sensitivity, a custom nightguard protects your teeth while you sleep. It won't restore worn enamel, but it stops the damage from continuing.
Fillings or crowns. If a cavity or crack is behind your sensitivity, it needs to be treated directly. A filling or crown seals the tooth and eliminates the source of the problem.
Gum grafting. For significant gum recession, a periodontist can graft tissue to cover exposed roots. This is a more involved procedure but the right solution for severe cases.
When Should You See a Dentist?
See us if: sensitivity is sharp, severe, or getting worse; it lingers for more than 30 seconds after the trigger is removed; one specific tooth is more sensitive than others; you have visible cracks, chips, or darkening of a tooth; you also have pain when biting or chewing. Sensitivity that comes and goes and affects multiple teeth is often manageable with toothpaste and fluoride. Sensitivity that's worsening, isolated to one tooth, or accompanied by pain when biting is a signal to come in. We serve patients from Mobile, Theodore, Grand Bay, and the surrounding Gulf Coast area.
Frequently Asked Questions
It depends on the cause. Mild sensitivity from enamel erosion or whitening is usually manageable. Sensitivity from a crack, cavity, or dying nerve is more serious and needs treatment. When in doubt, have it checked.
In many cases, yes — by treating the underlying cause. If a cavity is causing sensitivity, a filling fixes it. If grinding is the culprit, a nightguard stops the damage. Some causes, like significant enamel loss, can be managed but not fully reversed.
A sudden increase in sensitivity often points to a specific problem — a crack, a new cavity, or gum recession. It's worth coming in for an exam to figure out what changed.
No. Whitening-related sensitivity is temporary and usually resolves within a few days to a week. Using a desensitizing toothpaste before and after whitening can help.
Dr. Joseph Gegzna, DMD is the founder and lead dentist at Rabbit Creek Dental in Mobile, Alabama. He earned his Doctor of Dental Medicine degree from the University of Louisville School of Dentistry and has been a licensed dentist in Alabama since 2014, with more than 12 years of experience in general, restorative, and implant dentistry. After several years practicing as an associate, he founded Rabbit Creek Dental in 2022 to build the kind of patient-first practice he believed in. He has completed advanced implant training through a 92-hour Implant Pathway program with live patient surgery and additional surgical training in impacted third molar extractions through the Koerner Center for Surgical Instruction. He is a member of the American Dental Association and is currently in his third year of the Bulletproof Dental Mastermind program, a continuing education group focused on delivering an exceptional patient experience. Before dentistry, Dr. Gegzna was a licensed pilot, bringing a calm, detail-oriented approach to patient care. Rabbit Creek Dental serves families throughout Mobile.
This article is for educational purposes only and does not constitute medical advice. For personalized guidance about your dental health, please contact our office at (251) 308-0584.