A sip of cold water or a bite of something sweet makes your teeth wince; that may be due to tooth sensitivity. It is one of the most common concerns patients raise with their dentists.

If your teeth are suddenly sensitive, the cause may be exposed dentine, worn enamel, gum recession, decay or a damaged tooth. The right dental sensitivity treatment depends on the underlying problem, so persistent symptoms should not be ignored.

At Phoenix Road Dental, we see patients with sensitive teeth every week. Below, we explain the causes of tooth sensitivity, what the pain feels like, and how to find lasting relief.

What Causes Sensitive Teeth?

Sensitive teeth are usually caused when dentine, the softer layer beneath the enamel, becomes exposed. Your teeth are protected by hard enamel, while your gums help cover and protect the tooth roots. Dentine contains tiny tubes that connect to the nerve inside each tooth.

When enamel wears down, or gums recede, hot, cold, sweet or acidic substances can travel through these tubes and stimulate the nerve. This causes the short, sharp pain known as dentine hypersensitivity, commonly called tooth sensitivity.

Why Your Teeth Get Suddenly Sensitive?

A sudden change usually points to something specific, such as a new crack, a filling that needs attention, recent whitening, or a habit like grinding that has been going on quietly for a while. If your teeth are suddenly sensitive and the feeling does not settle within a week or two, it is worth having it checked rather than waiting it out.

Common Triggers Behind Sensitive Teeth

1. Worn or Eroded Enamel

Regularly eating or drinking acidic foods, such as citrus fruit, soft drinks, wine or sports drinks, gradually softens and wears away enamel. Once enough enamel is lost, the dentine underneath is exposed and reacts to hot and cold. Brushing straight after acidic food or drink makes this worse, as the softened enamel can be brushed away before it has time to harden again.

2. Gum Recession

Gums can shrink away from the teeth over time, whether from gum disease, brushing too hard, or simply age. When this happens, the tooth root, which has no enamel covering, is left exposed. Roots are naturally more sensitive than the crown of the tooth, so recession is a common reason teeth become sensitive to cold.

3. Tooth Decay or Damaged Fillings

Sensitivity that lingers after the trigger has gone, rather than fading quickly, can be a sign of tooth decay or a filling that is breaking down. This is one of the causes of tooth sensitivity that needs a dentist to fix rather than a change in toothpaste, since the underlying problem will only get worse without treatment. Left untreated, decay can reach the nerve and require root canal treatment, so it is best not to wait until the pain becomes constant.

4. Teeth Grinding and Clenching

Grinding or clenching your teeth, often during sleep, wears down enamel over time and can even cause small cracks. This kind of wear can leave teeth sensitive to hot and cold, along with a dull ache in the jaw on waking.

5. Recent Dental Treatment

Teeth are often sensitive for a few days to two weeks after a filling, scale and clean, or other dental work. This is normal and usually settles on its own. If sensitivity continues beyond two weeks or turns into real pain, book a dental checkup so we can take a closer look.

Dental Sensitivity Treatment: How to Treat Sensitive Teeth

Is there a sensitive teeth cure? In most cases, yes, once the cause is identified, it gets easy to treat tooth sensitivity.

• Desensitising toothpaste: These toothpastes work in one of two ways: soothing the nerve so it stops reacting to triggers, or forming a barrier over exposed dentine. They can help with mild sensitivity but will not fix sensitivity caused by decay.
• Fluoride treatments: Professional fluoride varnish strengthens enamel and helps block the tubes in dentine that transmit pain. Fluoride toothpaste at home supports this between visits.
• Fillings or restorations: If decay or a failing filling is the cause, restoring the tooth with a tooth-coloured filling removes the source of sensitivity for good.
• A professional clean: A gentle scale and clean using airflow technology removes plaque and tartar with far less discomfort than traditional scaling, which is especially helpful if your gums and teeth are already sensitive.
• A nightguard: If grinding is the cause, a custom nightguard protects your enamel while you sleep.

Rather than guessing with over-the-counter products, get a proper assessment first. Once the cause is clear, your dentist can recommend the right dental sensitivity treatment. This is particularly important if you are considering teeth whitening, as whitening products can temporarily increase sensitivity and may not be suitable until underlying dental problems are treated.

Can You Have Teeth Whitening for Sensitive Teeth?

Teeth whitening can cause temporary sensitivity, so your teeth and gums should be assessed first. Decay, cracked teeth or exposed roots may need treatment before whitening.

Professional, dentist-supervised whitening, such as our Zoom teeth whitening treatment, allows the strength and application time to be tailored to your teeth. A desensitising paste is applied afterwards to protect your enamel and keep discomfort to a minimum, so your teeth and gums are looked after throughout. Off-the-shelf whitening kits are far less controlled and can leave already-sensitive teeth feeling worse.

If you are considering teeth whitening for sensitive teeth, speak with Phoenix Road Dental’s team first so we can recommend an approach suited to your mouth.

When Teeth and Gums Hurt: Could It Be a Dental Emergency?

Mild, short-lived sensitivity is common and rarely urgent. However, you should seek prompt care if your teeth and gums hurt persistently, or if you notice:

• Constant or throbbing pain, rather than a brief reaction
• Swelling in the face or gums
• A bad taste or discharge near a tooth
• Pain severe enough to disturb sleep or eating

These can be signs of infection or advanced decay, which need attention sooner rather than later. Our emergency dentistry team in Perth can see you promptly if you are in significant pain or think something is seriously wrong.

How to Reduce Tooth Sensitivity at Home

To protect sensitive teeth:

• Brush twice daily with fluoride toothpaste and a soft-bristled toothbrush
• Use gentle pressure rather than scrubbing
• Floss daily
• Limit frequent acidic and sugary foods and drinks
• Wait at least 60 minutes before brushing after acidic food or drinks
• Drink tap water and avoid swishing acidic drinks around your mouth
• Speak with your dentist before using whitening products

These habits can help reduce enamel wear and mild sensitivity, but they cannot repair decay, a broken filling or an infected tooth.

Treat Sensitive Teeth at Phoenix Road Dental

Occasional mild sensitivity is not usually a cause for alarm, but new sensitivity, worsening, or lasting more than a week or two deserves a proper look. Our team at Phoenix Road Dental will assess your teeth and gums, identify what is really causing your sensitivity, and put together a plan to treat it, so you can enjoy your morning coffee or an ice-cold drink without wincing.

If you are dealing with sensitive teeth, book an appointment with our friendly Spearwood team today.