Most of us have felt that sharp, sudden sting when you sip a hot coffee or bite into an ice cream cone at some point. Tooth sensitivity is one of the most common dental complaints we hear about at Avalon Dental, and the good news is that it is almost always treatable. The key is understanding what is causing it.
Below, we will walk you through the most common reasons teeth become sensitive, when you should get it checked out, and what your dentist can do to help.
What Is Tooth Sensitivity?
Tooth sensitivity is a sharp or lingering pain triggered by certain temperatures, textures, or foods. It happens when the inner layer of your tooth, called dentin, becomes exposed. Dentin contains thousands of tiny channels that lead directly to the nerve. When those channels are unprotected, everyday things like cold air, hot drinks, sweet foods, or even brushing can set off a pain signal.
The sensation can range from a brief twinge to a more lasting ache, and it can affect one tooth or several at once.
Common Causes of Tooth Sensitivity
Sensitivity is a symptom, not a diagnosis on its own. A number of different dental issues can cause it, which is why it is important to get to the root cause rather than just managing the discomfort.
Enamel erosion
Enamel is the hard outer shell that protects your teeth. When it wears away, often from acidic foods and drinks, frequent vomiting, or aggressive brushing, the dentin underneath becomes exposed and vulnerable. Once enamel is lost, it does not grow back, but your dentist can help protect what remains.
Gum recession
When your gums pull back from the base of your teeth, they expose the root surfaces, which have no enamel covering them at all. Root surfaces are naturally more sensitive, and gum recession can happen gradually over time.
Gum disease is one of the most common causes of recession, which is why regular scaling and hygiene visits are so important for catching it early.
Cavities and tooth decay
A developing cavity removes the protective structure of your tooth, leaving the nerve closer to the surface. If a sweet or cold food suddenly causes a sharp pain in one specific tooth, decay could be the culprit. A comprehensive dental examination and dental X-rays can identify cavities that are not yet visible to the eye, so early treatment with a dental filling can stop sensitivity before it gets worse.
Cracked or chipped teeth
Even a hairline crack in a tooth can create a pathway to the nerve. You may notice sensitivity that comes and goes, or pain that is triggered by biting in a specific way. Cracks can be tricky to spot without a proper examination, so it is always worth mentioning to your dentist if you notice any unusual sensitivity after biting into something firm.
Worn or old fillings
Fillings do not last forever. Over time, they can crack, shrink, or pull away from the surrounding tooth, leaving gaps that allow bacteria and temperature to reach the dentin. If a previously restored tooth suddenly becomes sensitive again, the filling may need to be replaced.
Teeth grinding (bruxism)
Grinding your teeth puts enormous pressure on your enamel over time. Many people who grind are not aware they are doing it until their dentist notices wear patterns or they develop sensitivity and jaw discomfort. If grinding is suspected, a custom biteplane or night guard can protect your teeth from further wear.
Teeth whitening
Whitening treatments temporarily increase sensitivity for some patients, particularly in the first day or two after treatment. This is usually short-lived and settles on its own, but letting your dentist know before beginning teeth whitening is always a good idea, especially if you already have sensitive teeth.
Will Tooth Sensitivity Go Away on Its Own?
It depends on the cause. Sensitivity from a recent whitening treatment or a new filling often settles within a few days. But sensitivity caused by enamel erosion, gum recession, a crack, or a cavity will not resolve without treatment and in many cases it will get worse over time if left unaddressed.
If your sensitivity has lasted more than a few days, is affecting a specific tooth, or is getting sharper over time, it is worth booking an appointment to have it assessed.
How Your Dentist Can Help
The right treatment depends entirely on what is causing the sensitivity. At Avalon Dental, we start by identifying the source before recommending anything. Here is what treatment might look like depending on your situation:
- Desensitizing treatments: Your dentist can apply fluoride varnish or bonding agents directly to exposed dentin to reduce the pain signal. These in-office treatments are quick and often provide noticeable relief.
- Fluoride application: Fluoride helps strengthen enamel and can reduce sensitivity by reinforcing the protective layer around your teeth. This is often done as part of a routine scaling and cleaning visit.
- Dental sealants: For teeth with deep grooves or areas particularly prone to sensitivity, dental sealants can provide an extra protective barrier against temperature and bacteria.
- Treating the underlying cause: If sensitivity is caused by decay, your dentist will place a filling to restore the tooth. If gum disease is contributing to recession, a thorough scaling and improved home care routine will be the starting point. For cracked teeth, options may include bonding, a crown, or other restorative treatment depending on severity.
- Biteplane or night guard: If grinding is the root cause, a custom-fitted biteplane protects your enamel and takes pressure off your jaw.
- At-home recommendations: Your dentist may also recommend a sensitivity toothpaste, a softer toothbrush, or changes to your brushing technique to reduce irritation between visits.
Tips for Managing Sensitivity at Home
While your dentist works on the underlying cause, there are a few things you can do day-to-day to reduce discomfort:
- Switch to a soft-bristled toothbrush and use gentle, circular strokes rather than scrubbing.
- Use a toothpaste designed for sensitive teeth. Look for potassium nitrate or stannous fluoride as the active desensitizing ingredient.
- Limit acidic foods and drinks like citrus, pop, and vinegar-based foods, and rinse with water afterward when you do have them.
- Avoid brushing immediately after eating acidic foods. Wait about 30 minutes to let your saliva neutralize the acid first.
- Drink cold or icy drinks through a straw to reduce direct contact with sensitive teeth.
These steps can help, but they are not a substitute for finding and treating the cause.
When to Book an Appointment
What starts as occasional discomfort can become a bigger issue over time and most of the causes are straightforward to treat when caught early.
At Avalon Dental in St. John’s, our team takes the time to understand what is driving your sensitivity before recommending any treatment. Whether it is a simple fluoride application or a more involved restorative solution, we will help you find lasting relief.
