Sensitive teeth are usually caused by exposed dentine, the layer beneath the tooth enamel, which allows temperature, pressure and sweet or acidic foods to reach the nerve inside the tooth. The most common causes include enamel erosion, gum recession, tooth grinding and untreated decay. In most cases sensitivity is treatable, but it can also be a sign that something needs attention from a dentist.
What Causes Sensitive Teeth?
Tooth sensitivity happens when the protective outer layer of the tooth, the enamel, becomes thinner or when the gum tissue pulls back to expose the root surface. Both expose the dentine underneath, which contains tiny channels that lead to the tooth’s nerve. When hot, cold, sweet or acidic substances reach these channels, you feel the familiar sharp, fleeting discomfort associated with sensitive teeth.
The most common underlying causes are:
- Enamel erosion: caused by acidic food and drink, acid reflux or brushing too hard over time
- Gum recession: exposing the root surface, which has no enamel covering
- Tooth grinding (bruxism): wearing down the enamel, often during sleep
- Tooth decay or a cracked tooth: allowing stimuli to reach the nerve more easily
- Recent dental treatment: including fillings, crowns or whitening, which can cause temporary sensitivity
Understanding the cause matters because the right treatment depends on what is driving the sensitivity. Routine appointments with our hygienist team often identify early signs of enamel wear and gum recession before sensitivity becomes a significant problem.
Why Are My Teeth Suddenly Sensitive?
Sudden sensitivity that was not there before is worth paying attention to. It often points to a specific trigger rather than gradual enamel wear.
A new crack or chip in a tooth can expose dentine rapidly, causing sensitivity that seems to appear from nowhere. A filling that has failed or a cavity that has developed can do the same. Sudden sensitivity across multiple teeth at once can also be linked to an acidic dietary change or a new whitening product.
If you notice sensitivity that has come on suddenly and does not ease within a few days, booking a consultation is the safest way to identify the cause before it progresses.
Why Are My Teeth Sensitive to Cold?
Cold sensitivity is the most common type and is usually the first sign that enamel has thinned or that gum recession has exposed the root surface. Cold water or cold air hitting the exposed dentine triggers the nerve response that produces the sharp sensation.
In most cases the discomfort passes within a few seconds. If the pain lingers for 30 seconds or more after the cold trigger is removed, it can indicate that the nerve inside the tooth is inflamed, which may need root canal treatment to resolve.
Why Are My Teeth Sensitive After Whitening?
Whitening-related sensitivity is common and usually temporary. The whitening gel works by opening the pores in the enamel to lift staining, which temporarily increases dentine exposure. This typically settles within 24 to 48 hours after each whitening session.
Using a toothpaste formulated for sensitive teeth during and after your whitening course can help manage this. If sensitivity during whitening is significant, your dentist can adjust the concentration or schedule of your treatment, and our professional teeth whitening is always preceded by a clinical assessment to confirm suitability.
How Do You Treat Sensitive Teeth?
Treatment depends on the cause, but there are several effective approaches.
Sensitivity caused by enamel erosion or early gum recession often responds well to using a toothpaste specifically designed for sensitive teeth, which works by blocking the dentine channels over time. Switching to a softer toothbrush and reviewing brushing technique can also help prevent further wear.
Where gum health is contributing to sensitivity, a visit to the dental hygienist is often the most effective starting point. A professional clean removes the plaque and tartar that drive gum inflammation, and EMS Airflow treatment reaches areas that standard cleaning misses. Our guide to removing tartar from teeth covers the role of plaque control in preventing sensitivity at the gum line.
For sensitivity caused by grinding, a custom-made nightguard can protect the enamel from further wear during sleep. Where decay or a crack is the cause, a composite filling or crown may be needed to restore the tooth and seal off the dentine.
When Should I See a Dentist About Sensitive Teeth?
Occasional mild sensitivity that comes and goes is not always a cause for concern, particularly if it is linked to a known trigger such as very cold drinks. However, there are circumstances where you should seek advice sooner rather than later.
See a dentist if your sensitivity is severe, persistent or getting worse over time. Equally, if the sensitivity is in a specific tooth rather than generally across your smile, this can indicate decay, a crack or nerve involvement that will not resolve without treatment. Day-to-day oral hygiene habits also play a significant role in preventing sensitivity from developing in the first place.
Treating Sensitive Teeth in Prestwich
Bank Dental Practice is a private dentist in Prestwich, Manchester. Whether your sensitivity has built up gradually or come on suddenly, our team can identify the cause and recommend the right course of action. Many cases of sensitive teeth are straightforward to manage once the underlying reason has been established.
Patients visit us from across the local area including Whitefield, Bury, Salford and Swinton, and as a cosmetic dentist in Manchester we also see patients looking to combine sensitivity treatment with wider improvements to their smile. To discuss your symptoms or book a consultation with the team, get in touch today.
Frequently Asked Questions
Why Are My Teeth Sensitive All of a Sudden?
Sudden sensitivity is often caused by a new crack or chip, a failing filling, an emerging cavity or a recent change in diet or dental products. If sudden sensitivity does not ease within a few days, a dental appointment is advisable to identify and address the cause before it progresses.
Why Are My Front Teeth Sensitive?
Front teeth can become sensitive through enamel erosion from acidic food and drink, overbrushing or grinding. Because front teeth have thinner enamel than molars, they can be more susceptible to sensitivity when that enamel wears. A dentist can assess whether the enamel is the cause or whether gum recession is exposing the root surface.
Can Sensitive Teeth Be Cured?
In many cases, yes. Sensitivity caused by enamel erosion, gum recession or grinding can be significantly reduced with the right treatment and changes to daily habits. Where decay or a crack is the cause, restoring the tooth resolves the sensitivity directly. Some sensitivity, particularly that linked to gum recession, may need ongoing management rather than a single cure.
Is Tooth Sensitivity a Sign of Something Serious?
Not always, but it can be. Sensitivity that is getting worse, is concentrated in one tooth, lingers long after a trigger, or is accompanied by pain when biting should always be assessed by a dentist. These patterns can indicate nerve involvement, decay or a crack that needs treatment.
Does Sensitive Teeth Toothpaste Work?
Sensitive teeth toothpaste can be effective for mild sensitivity caused by exposed dentine. It works by blocking the channels in the dentine over time, gradually reducing the nerve response. For it to work, it needs to be used consistently and left in contact with the teeth, so avoid rinsing immediately after brushing. It will not address sensitivity caused by decay, a crack or gum disease, which need clinical treatment.
