What Causes Teeth Sensitivity? Common Triggers and What Helps

That sharp, short jolt of pain when you sip something cold or bite into ice cream is one of the most common dental complaints there is. For some people it’s an occasional annoyance; for others it’s a daily reminder that something in the mouth has changed. Here’s what actually causes teeth sensitivity, and what helps.

What Is Tooth Sensitivity?

Tooth sensitivity happens when the dentin, the layer just beneath the hard enamel, becomes exposed or more easily stimulated. Dentin is full of microscopic tubules that lead to the nerve inside the tooth, so when it’s exposed to hot, cold, sweet, or even cold air, that nerve reacts, producing the brief, sharp pain known as sensitivity. The tooth itself isn’t necessarily damaged or decaying; it just has less protection than it used to.

What Causes Teeth Sensitivity?

Several things can expose dentin or irritate the nerve inside a tooth, and more than one is often at play:

• Worn or eroded enamel: acidic foods and drinks (citrus, soda, wine), and even stomach acid from reflux, gradually soften and wear away enamel over time, exposing the dentin underneath.
• Gum recession: when gums pull back, the root surface of the tooth is left uncovered. Roots have no enamel at all, so they’re far more reactive to temperature and touch. This is one of the most common causes of sensitivity in adults, and it’s worth reading about what causes receding gums if this sounds familiar.
• Teeth whitening: both professional and over-the-counter whitening treatments can cause temporary sensitivity by allowing the whitening agent to reach the dentin. It typically fades within a few days of finishing treatment.
• Tooth decay or a cracked tooth: a cavity or crack can expose dentin directly, and sensitivity is often one of the first signs something needs attention, well before pain becomes constant.
• Teeth grinding (bruxism): grinding wears down enamel over months and years, and it’s a common, often overlooked cause of sensitivity. A night guard is usually the simplest fix once grinding is confirmed.
• Brushing too hard: a hard-bristled brush or heavy pressure wears away enamel and can contribute to gum recession, especially along the outer surfaces of the teeth.
• Recent dental work: it’s normal to have mild sensitivity for a few days to a couple of weeks after a filling, crown, or deep cleaning, as the tooth settles.

Occasional vs. Persistent Sensitivity

A quick twinge when you drink something icy is usually nothing to worry about. Sensitivity that’s becoming more frequent, more intense, lingers after the hot or cold trigger is gone, or is focused on a single tooth rather than several, is a different matter. Lingering pain in particular can point to something more serious happening inside the tooth, rather than just an exposed nerve ending.

How to Relieve Sensitive Teeth at Home

• Switch to a desensitizing toothpaste, which works by gradually blocking the tubules in the dentin. It usually takes a couple of weeks of consistent use to notice a difference.
• Use a soft-bristled brush and gentle, circular motions rather than scrubbing.
• Cut back on acidic foods and drinks, or rinse with water afterward rather than brushing right away, since enamel is temporarily softened after acid exposure.
• Avoid extreme temperature swings where you can, like alternating hot coffee with ice water.
• Pause whitening treatments for a while if sensitivity started after using one, and consider a gentler formulation next time.

Treatment Options a Dentist Might Recommend

If home care isn’t enough, a dentist has more targeted options depending on the cause:

• Fluoride varnish or in-office desensitizing treatments strengthen enamel and reduce nerve sensitivity more quickly than toothpaste alone.
• Bonding can cover exposed root surfaces or worn areas of enamel with a protective resin, which is often used when sensitivity is caused by gum recession rather than decay.
• A custom night guard if grinding is the underlying cause, protecting both the enamel and any existing dental work from further wear.
• A filling, crown, or root canal if the sensitivity is being caused by decay or damage that’s reached the inner tooth. In these cases the sensitivity is a symptom of the underlying problem, not something to treat on its own.
• Professional cleaning to address any plaque or tartar buildup that’s irritating the gums and contributing to recession.

When to See a Dentist

Book an appointment if sensitivity is getting worse, lingers well after the trigger is gone, is limited to one tooth, or comes with visible swelling, a cracked tooth, or pain when you bite down. These are signs that something more specific than general sensitivity is going on, and an exam (sometimes with an X-ray) is the only reliable way to find out what it is and treat it properly.

Getting Started

If sensitive teeth have been bothering you and you’re not sure why, reach out to Dentavivo and we can help you figure out what’s causing it and what will actually fix it.