‘What causes sensitive teeth?’ This is a common question we get. We’ll explore why tooth sensitivity happens, the most common causes of sensitive teeth, what treatments are available, and when it’s time to stop suffering in silence and see your dentist.
That sharp, sudden jolt of pain when you sip a cold drink, bite into something sweet, or even breathe in cold air — sound familiar?
Tooth sensitivity is one of the most common dental complaints, yet many people simply put up with it, assuming it’s just part of life. It’s not. Sensitivity is your teeth telling you something, and in most cases, it’s very treatable.
What Is Tooth Sensitivity?
Tooth sensitivity — or dentinal hypersensitivity — is a sharp pain or discomfort that occurs when your teeth are exposed to certain triggers. It can affect one tooth, several teeth, or your entire mouth.
Common triggers include:
- Cold food and drinks (ice cream, cold water)
- Hot beverages (coffee, tea)
- Sweet or acidic foods
- Cold air
- Brushing or flossing
- Biting down or chewing
The pain is usually brief but intense, and it can catch you completely off guard.
Why Does It Happen? Understanding the Cause
Your teeth are protected by a hard outer layer called enamel.
Underneath the enamel sits a softer layer called dentine, which contains thousands of tiny channels (called dentinal tubules) that lead to the nerve at the centre of your tooth. When enamel wears down or gums recede, these tubules become exposed — and that’s when sensitivity strikes.
Here are the most common reasons this happens:
1. Worn Tooth Enamel
Enamel erosion is often caused by a highly acidic diet (soft drinks, citrus, vinegar-based foods), frequent vomiting (such as from acid reflux or morning sickness), or simply over-enthusiastic brushing. Once enamel is gone, it doesn’t grow back — but it can be protected and treated.
2. Gum Recession
When your gums pull back from the teeth, the root surface becomes exposed. Unlike the crown of your tooth, roots have no enamel — so they’re especially vulnerable. Gum disease and aggressive brushing are common culprits.
3. Teeth Grinding (Bruxism)
Many people grind or clench their teeth without even realising it — often at night. Over time, this wears down the enamel and can cause widespread sensitivity across multiple teeth.
4. Cracked or Chipped Teeth
A crack in a tooth can expose the dentine or even the nerve, causing sharp sensitivity — particularly when biting down.
5. Tooth Decay or a Cavity
A cavity that’s reached the inner layers of a tooth will often cause sensitivity before it causes outright pain. It’s your tooth’s early warning signal.
6. Recent Dental Treatment
It’s completely normal to experience some sensitivity after a filling, teeth whitening, or a scale and clean. This usually settles within a few days to a couple of weeks.
7. Acidic or Whitening Toothpastes
Some whitening toothpastes and acidic oral care products can temporarily increase sensitivity, especially with regular use.
When Should Come And See Us About Your Sensitive Teeth
A lot of people reach for sensitive toothpaste and hope for the best. And while that can help manage mild sensitivity, it’s important to understand that sensitivity is a symptom — not a diagnosis.
It’s worth coming in to see us if:
- Sensitivity is getting worse over time
- The pain lingers for more than a few seconds after the trigger is removed
- Only one tooth is affected (this often points to a specific cause like a crack or cavity)
- You also notice swelling, visible damage, or tooth pain at rest
- Sensitivity is affecting your ability to eat or drink comfortably
Getting to the root cause early makes treatment simpler — and protects your teeth from further damage down the track.
Treatment Options for Sensitive Teeth
The right treatment depends on what’s causing your sensitivity. Your dentist will assess your teeth, identify the underlying issue, and recommend the most appropriate solution for you.
Desensitising Toothpaste
For mild, generalised sensitivity, fluoride-based desensitising toothpastes can help block the dentinal tubules over time and reduce discomfort. These work best with consistent, long-term use.
Fluoride Treatments
Your dentist can apply a concentrated fluoride gel or varnish directly to the sensitive areas. This helps strengthen the enamel and reduce nerve signals from exposed dentine.
Dental Bonding
If sensitivity is caused by exposed root surfaces or minor cracks, tooth-coloured composite resin can be bonded over the affected area to act as a protective barrier.
Dental Crowns or Veneers
For more significant enamel loss or structural damage, a crown or veneer may be recommended to fully cover and protect the tooth.
Gum Disease Treatment
If gum recession is the cause, treating the underlying gum disease — through a professional clean or more advanced periodontal care — can stop the recession from progressing and reduce sensitivity.
Occlusal Splint (Mouthguard for Grinding)
If teeth grinding is contributing to your sensitivity, a custom-fitted night splint can protect your enamel from further wear while you sleep.
Treating Decay or Damage
If a cavity, crack, or damaged filling is to blame, addressing that specific issue — with a filling, root canal, or crown — will often resolve the sensitivity directly.
How to Prevent Sensitive Teeth
A few simple habits can go a long way in protecting your enamel and keeping sensitivity at bay:
- Brush gently using a soft-bristled toothbrush and fluoride toothpaste — scrubbing hard doesn’t mean cleaner
- Limit acidic foods and drinks — and when you do have them, rinse with water afterwards rather than brushing immediately
- Use a straw for cold drinks, juices, and soft drinks to reduce contact with teeth
- Wear a mouthguard if you know you grind at night
- Keep up with regular check-ups so any enamel loss or gum changes are caught early
- Talk to your dentist before using whitening products, especially if you already have some sensitivity
Tooth sensitivity is common, but it’s not something you have to simply live with.
Whether it’s a fleeting twinge from cold water or a sharper, more persistent ache, your teeth are giving you useful information — and ignoring it can allow the underlying cause to worsen over time.
The good news is that with the right diagnosis, sensitivity is almost always treatable. Most people see a significant improvement with the right combination of professional treatment and at-home care.