You reach for an iced coffee, take a sip, and there it is: a sharp jolt in one tooth that catches you off guard.
It may be brief, but it can be difficult to ignore.
At Tooth Heaven in Kensington, tooth sensitivity is a common concern patients raise with us. Some people notice it when drinking something cold. Others experience sensitivity with hot tea, sweet foods, brushing or even breathing in cool air. It may affect one tooth or several teeth.
Sensitive teeth can occur when protective tooth enamel wears down or the gums recede, exposing the softer layer underneath, called dentine. Dentine contains tiny channels that communicate with the sensitive inner part of the tooth. When cold, heat, sweetness or touch reaches exposed dentine, it can trigger a short, sharp sensation. The Australian Dental Association provides further information about sensitive teeth and their possible causes.
Tooth sensitivity does not always have the same cause. It may be related to gradual enamel wear, gum recession, teeth grinding, tooth decay or a small crack. Sensitivity can also occur temporarily after some dental treatments.
Here are some of the common causes of sensitive teeth and what a dentist may consider when assessing them.
Enamel Erosion Is Often a Starting Point
Enamel is the hard outer layer that protects your teeth. Although it is strong, repeated exposure to acids can gradually wear it away. As enamel becomes thinner, the underlying dentine can become more exposed.
That can make everyday things such as cold drinks, citrus foods or sweet foods feel uncomfortable.
Enamel erosion usually develops gradually. You may not suddenly experience severe discomfort. Instead, you might notice that cold drinks feel sharper than they used to or that a tooth that previously caused no problems has started reacting when you brush.
Factors that may contribute to enamel erosion include:
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Acidic foods and drinks, including citrus, soft drinks, sports drinks and wine
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Frequently sipping acidic drinks throughout the day
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Brushing too soon after consuming acidic foods or drinks
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Gastric reflux, which can expose teeth to stomach acid
The Australian Dental Association explains that repeated and prolonged acid exposure can increase the risk of tooth erosion, which may lead to sensitivity to hot and cold temperatures.
How often your teeth are exposed to acid matters. Drinking something acidic with a meal is different from sipping it slowly over several hours, as repeated exposure gives the mouth less opportunity to recover between acidic episodes.
That does not mean you need to avoid every acidic food or drink. Being mindful of how frequently you consume them can help support your dental health.
Your Brushing Technique Might Be Working Against You
It may seem counterintuitive, but brushing too firmly can contribute to sensitive teeth.
Many people scrub their teeth because they want them to feel thoroughly clean. However, excessive pressure, particularly with a firm-bristled toothbrush, may contribute to tooth wear and gum irritation.
Your teeth do not need aggressive scrubbing to be cleaned effectively.
Using a soft-bristled toothbrush and gentle pressure is generally a better approach. Aim to clean thoroughly rather than forcefully, paying attention to the gumline without scrubbing it.
Brushing immediately after acidic foods or drinks may also be unhelpful. Acid temporarily softens the tooth surface, making it more vulnerable to wear.
After consuming something acidic, rinsing your mouth with water and allowing some time before brushing can be a useful habit. The Australian Dental Association's information on tooth erosion also advises against brushing immediately after acid exposure.
Small changes to your daily brushing routine can help reduce unnecessary wear over time.
Gum Recession Can Expose the Tooth Root
Gum recession is another possible cause of sensitive teeth.
Healthy gums cover and protect the roots of your teeth. When the gums move away from the teeth, part of the root surface may become exposed.
Tooth roots do not have the same protective enamel covering as the crowns of the teeth, so exposed root surfaces can be more responsive to cold temperatures, touch and brushing.
Gum recession can have several contributing factors, including:
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Gum disease
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Heavy or aggressive brushing
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Teeth grinding or clenching
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Tooth position
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Other individual oral health factors
Sometimes people do not notice gum recession until a tooth begins to look longer or sensitivity develops near the gumline.
Sensitivity associated with recession may feel particularly noticeable when a toothbrush touches a specific area or when cold water passes over an exposed root.
Because gum recession has several potential causes, having it professionally assessed is more useful than trying to determine the cause yourself.
Grinding Adds Pressure to Your Teeth
Clenching or grinding your teeth can also contribute to tooth sensitivity.
Teeth grinding, or bruxism, commonly occurs during sleep. Many people are unaware that they grind because it happens while they are asleep. Others may clench their teeth during the day, particularly while concentrating or feeling stressed.
Repeated grinding or clenching places additional pressure on the teeth. Over time, it can contribute to tooth wear, small cracks and tenderness. It may also cause discomfort in the jaw muscles.
The Better Health Channel explains that teeth grinding and clenching often happen during sleep and may cause tooth wear and other dental symptoms.
Possible signs of grinding or clenching can include:
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Tooth sensitivity
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A dull or tired feeling in the jaw
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Morning headaches
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Facial or jaw muscle soreness
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Teeth that appear flatter or more worn
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Chipped or cracked teeth
If you are concerned that teeth grinding may be affecting your teeth, mention your symptoms during your dental appointment.
A dentist can assess your teeth for wear patterns, chips, cracks and other signs of excessive pressure. Any treatment recommendation will depend on your individual symptoms, dental examination and the likely cause of the grinding.
Sensitivity After Dental Treatment
Some temporary sensitivity can occur after dental treatment.
Procedures such as teeth whitening, fillings and some professional cleaning or gum treatments can leave teeth feeling more sensitive for a period afterwards.
For example, Healthdirect notes that teeth can be temporarily sensitive to cold following teeth whitening.
After a filling, a tooth may also feel different or temporarily sensitive. Healthdirect recommends returning to your dental professional if sensitivity after a dental filling persists.
Sensitivity following treatment should generally improve rather than become progressively worse.
Contact your dentist if:
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The sensitivity is becoming more intense
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It persists longer than expected
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You develop ongoing pain
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Your bite feels uncomfortable after a filling
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You are concerned about any new symptoms
Sometimes the area simply needs time to settle. In other situations, a dentist may need to assess whether another issue is contributing.
A Chip or Crack Can Be the Hidden Cause
A chipped or cracked tooth can also cause sensitivity.
Even a small crack may allow temperature changes or biting pressure to affect more sensitive parts of the tooth. This can cause a sudden, sharp sensation, particularly when chewing.
Sensitivity from a cracked tooth can feel different from general sensitivity caused by enamel erosion or gum recession.
For example, you may experience a sharp sensation when biting on something and then notice it disappears when the pressure is released. Sometimes it can be difficult to identify exactly which tooth is responsible.
Cracks are not always easy to see yourself. Some may be very small, sit between teeth or only become apparent when pressure is applied in a particular way.
The Australian Dental Association lists sensitivity to hot and cold among the possible symptoms associated with cracked teeth.
For this reason, new sensitivity affecting one particular tooth, especially when biting, is worth having professionally assessed.
Tooth Decay Can Also Cause Sensitivity
Not all sensitivity results from exposed tooth surfaces or wear.
Tooth decay can also cause a tooth to become sensitive. As decay progresses through the tooth structure, you may begin to notice sensitivity to hot or cold foods and drinks.
Healthdirect identifies sensitivity when eating or drinking as a possible symptom of tooth decay.
Sensitivity associated with decay may start mildly and become more noticeable over time. It may also be concentrated in one particular tooth.
If one tooth repeatedly reacts more strongly than the others, or if the sensitivity seems to come from a very specific area, a dentist can check for possible causes such as decay, a damaged filling or another localised dental problem.
Getting the tooth assessed early can help your dentist determine what is happening and discuss appropriate treatment options based on the findings.
Sensitive Teeth Treatment Starts With Finding the Cause
Treatment for sensitive teeth depends on what is causing the sensitivity.
That is why a dental assessment can be important before relying on home remedies alone. Desensitising toothpaste can help some types of sensitivity, but it will not address every possible cause. The Australian Dental Association notes that toothpaste designed for sensitive teeth may help in some cases but will not treat sensitivity caused by tooth decay.
During an assessment, the Tooth Heaven dental team may ask questions such as:
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Does sensitivity occur with cold drinks?
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Does heat trigger it?
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Do sweet foods cause discomfort?
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Does brushing trigger the sensation?
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Does the tooth hurt when you bite?
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Is one tooth affected or several?
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Has the sensitivity appeared recently or gradually developed over time?
These details can help narrow down the possible cause.
Depending on the examination and your individual circumstances, recommendations may include:
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Using a desensitising toothpaste consistently
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Fluoride treatment where clinically appropriate
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Adjusting brushing technique
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Addressing gum recession where necessary
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Managing grinding or clenching if it is contributing
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Treating tooth decay
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Repairing a chipped or cracked tooth
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Reviewing recent dental treatment if sensitivity began afterwards
What is suitable for one person may not be suitable for another.
For example, if sensitivity is associated with brushing too firmly, adjusting your technique may be an important part of managing it. If grinding is contributing, protecting the teeth from ongoing pressure may need to be considered. If decay or a crack is present, the affected tooth may require specific dental treatment.
Treatment suitability, recommendations and results depend on the cause of your sensitivity, your oral health and an individual dental assessment.
Everyday Habits Worth Building In
Daily habits cannot replace a professional assessment when tooth sensitivity is persistent, but they can help support your oral health between visits.
Start with your toothbrush. A soft-bristled toothbrush and gentle pressure can help you clean effectively without unnecessary force. If the bristles of your toothbrush quickly flare outwards, you may be pressing harder than necessary.
You could also consider toothpaste designed for sensitive teeth. These products generally need to be used consistently rather than as a one-off treatment, and their effectiveness depends on what is causing the sensitivity.
It can also be helpful to consider how often your teeth are exposed to acidic foods and drinks during the day.
Simple habits may include:
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Use a soft-bristled toothbrush and gentle pressure.
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Consider toothpaste formulated for sensitive teeth.
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Reduce frequent sipping of acidic drinks throughout the day.
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Rinse your mouth with water after acidic foods or drinks.
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Avoid brushing immediately after consuming something acidic.
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Attend regular dental check-ups so changes can be assessed.
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Mention any teeth grinding, jaw discomfort or morning headaches to your dentist.
You do not need a complicated routine. The most appropriate habits are those that are realistic, consistent and suited to the underlying cause of your sensitivity.
When Is It Time to See a Dentist?
If tooth sensitivity is new, becoming worse or concentrated in one particular tooth, arranging a dental assessment is a sensible next step.
The Better Health Channel recommends seeing a dental practitioner if you are experiencing tooth pain or sensitivity.
At Tooth Heaven in Kensington, sensitivity can be assessed for a range of possible causes, including enamel wear, gum recession, grinding, decay, cracks and changes following dental treatment.
Some causes may require relatively simple changes to your daily routine, while others may need professional dental care. Identifying the likely cause helps your dentist recommend options that are appropriate for your individual circumstances.
If cold drinks, brushing or chewing regularly trigger tooth sensitivity, contact Tooth Heaven to arrange an assessment with the Kensington dental team and discuss suitable options for your oral health.
FAQs
Why are my teeth suddenly sensitive when they were not before?
New tooth sensitivity can have several possible causes, including enamel erosion, gum recession, teeth grinding, decay, a cracked tooth or recent dental treatment.
If sensitivity appears suddenly, becomes more noticeable or affects one particular tooth, a dental assessment can help identify the likely cause.
Is tooth sensitivity always caused by enamel erosion?
No. Enamel erosion is one possible cause, but exposed tooth roots from gum recession, grinding or clenching, tooth decay, cracks and some dental treatments can also contribute to sensitivity.
The cause needs to be identified before appropriate treatment or management can be recommended.
Can sensitive teeth get better on their own?
Some temporary sensitivity, such as sensitivity following certain dental treatments, may settle over time. However, ongoing or worsening sensitivity should not automatically be assumed to resolve on its own.
If symptoms persist, a dentist can check whether an underlying dental problem needs attention.
What toothpaste can help sensitive teeth?
Toothpaste formulated for sensitive teeth may help some people when used consistently. Different products work in different ways, and they will not address every cause of sensitivity.
If your symptoms continue, your dentist can assess the cause and advise whether a desensitising toothpaste is appropriate for you.
Does tooth sensitivity mean I have a cavity?
Not necessarily. Tooth decay can cause sensitivity, but so can enamel erosion, gum recession, grinding, cracks and other dental issues.
A dental examination is the most reliable way to determine whether decay or another problem is responsible.
Can teeth grinding cause sensitive teeth?
Yes, grinding or clenching may contribute to tooth sensitivity by placing repeated pressure on the teeth and contributing to tooth wear or damage.
If sensitivity occurs alongside jaw soreness, morning headaches or noticeable tooth wear, tell your dentist so these symptoms can be assessed together.
When should I see a dentist about sensitive teeth?
Consider booking a dental appointment if sensitivity:
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Appears suddenly
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Is becoming more noticeable
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Regularly affects one particular tooth
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Occurs when biting or chewing
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Continues after recent dental treatment
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Is accompanied by toothache, swelling, cracks or other new symptoms
Your dentist can investigate the cause and discuss treatment or management options based on your individual assessment.