Posted by David Chotiner
on May 12, 2026
By Dr. Dave Chotiner, DDS
If you've ever winced at a sip of cold water or flinched when biting into ice cream, you already know what tooth sensitivity feels like. What you might not know is why it's happening, whether it's getting worse, and what you can actually do about it beyond switching to a "sensitive" toothpaste and hoping for the best.
I see sensitivity complaints in my practice daily. It's one of the most common reasons patients mention at checkups, and it's one of the most misunderstood. Here's the clinical picture.
The mechanism: why teeth feel pain
Healthy tooth enamel is a dense mineral shield. It doesn't contain nerves. You can tap on intact enamel all day and feel nothing.
Beneath enamel is dentine, a softer, porous tissue crisscrossed with microscopic channels called dentinal tubules. These tubules run from the outer surface of the dentine directly to the tooth's nerve (the pulp). When enamel thins or wears away and dentine becomes exposed, stimuli like temperature, pressure, and acidity can reach the nerve through these tubules.
That's sensitivity. It isn't a disease. It's a consequence of enamel loss or gum recession exposing the dentine underneath.
What causes enamel to thin
Acid erosion
The most common cause I see. Dietary acids (citrus, soda, coffee, wine, sparkling water) and bacterial acids (from S. mutans metabolizing sugar) dissolve the mineral content of enamel over time. The process is gradual: first the enamel surface softens, then it thins, then dentine becomes exposed.
Frequent snacking and sipping on acidic drinks throughout the day is worse than consuming the same amount at meal times. The issue is duration of acid exposure, not just quantity.
Brushing too hard
Aggressive brushing with a medium or hard bristle brush physically wears enamel, particularly at the gumline where enamel is thinnest. Electric toothbrush users with heavy hands can do the same damage. Use a soft brush, light pressure, and let the bristles do the work.
Teeth grinding (bruxism)
Grinding wears enamel from the biting surfaces. If you wake up with jaw soreness, your partner reports grinding sounds, or your dentist notices flat, worn tooth surfaces, bruxism is likely contributing to your sensitivity. A night guard protects enamel from further wear.
Gum recession
When gums recede, they expose the root surface, which is covered by cementum rather than enamel. Cementum is thinner and softer than enamel and wears away quickly, exposing root dentine directly. Causes include aggressive brushing, periodontal disease, tobacco use, and genetic predisposition.
Post-procedure sensitivity
Teeth whitening, fillings, crowns, and other dental procedures can cause temporary sensitivity. This usually resolves within days to weeks. If it persists beyond a month, follow up with your dentist.
How to fix sensitive teeth: what actually works
Remineralize exposed enamel
If your sensitivity is from early-stage enamel thinning (not full erosion through to dentine), remineralization can rebuild mineral density and reduce sensitivity. Nano-hydroxyapatite has particularly strong evidence here. A 2019 clinical study found nano-HA comparable to 1,450ppm fluoride toothpaste in reducing dentine hypersensitivity. It works by depositing calcium phosphate into the microscopic pores of compromised enamel, restoring the mineral barrier.
RevitaBite delivers nano-HA to tooth surfaces throughout a chew, including the gumline areas where sensitivity most commonly originates. Most users with sensitivity report improvement within 4-8 weeks of daily use.
Block exposed tubules
Desensitizing toothpastes work by either blocking dentinal tubules (stannous fluoride, strontium chloride) or numbing the nerve response (potassium nitrate). Both approaches reduce sensitivity, but through different mechanisms.
Nano-hydroxyapatite takes a third approach: it physically fills the exposed tubule openings with mineral that matches the tooth's own composition. This is closer to actual repair than blocking or numbing.
Reduce acid exposure
If acid erosion is the underlying cause, no amount of treatment will help until you address the source. Limit between-meal acidic beverages, wait 30 minutes after acid exposure before brushing, and rinse with plain water after acidic meals. These are simple changes that directly reduce the rate of ongoing enamel loss.
Address the root cause
Grinding? Get a night guard. Aggressive brushing? Switch to a soft brush with light pressure. Gum recession from periodontal disease? Treat the disease. Sensitivity is a symptom. Treating it without addressing the cause is temporary at best.
Professional options
For severe or persistent sensitivity, in-office treatments include fluoride varnish application, dentine bonding agents that seal exposed tubules, and gum grafting for recession-related exposure. Talk to your dentist if at-home approaches aren't resolving the issue within 8-12 weeks.
When to see your dentist about sensitivity
Sensitivity that's new, sudden, or localized to one tooth could indicate a crack, cavity, or failing restoration. Don't assume it's just "sensitivity." If the sensation is sharp rather than dull, is confined to one specific tooth, appeared suddenly without an obvious cause, or is accompanied by visible damage, swelling, or discoloration, get it checked.
Generalized, mild sensitivity that's been gradually developing is more consistent with enamel wear and responds well to the approaches described above.
FAQ
Why are my teeth suddenly sensitive?
Sudden sensitivity in one tooth usually indicates a specific problem: a crack, new cavity, or failing filling. See your dentist. Sudden generalized sensitivity can follow teeth whitening, a dietary change (increased acid intake), or starting a new medication that causes dry mouth.
Does sensitive teeth mean I have cavities?
Not necessarily. Sensitivity from enamel thinning or gum recession is common and doesn't mean you have cavities. However, cavities can also cause sensitivity, especially to sweet foods. Your dentist can tell the difference with an exam and X-rays.
How long does it take for sensitive teeth toothpaste to work?
Most desensitizing toothpastes require 2-4 weeks of consistent twice-daily use before you notice a difference. Nano-hydroxyapatite products typically show improvement in sensitivity within 4-8 weeks. Neither works with occasional use; consistency is essential.
Can tooth sensitivity go away on its own?
Temporary sensitivity (from whitening, dental work, or cold weather) often resolves on its own. Sensitivity from progressive enamel loss or gum recession will not improve without intervention. It will gradually worsen as more dentine is exposed.
Is tooth sensitivity permanent?
Early-stage sensitivity from enamel thinning can be improved or reversed with consistent remineralization. Sensitivity from significant enamel loss or advanced gum recession may require professional treatment. The earlier you address it, the better the outcome.
