Why Are My Teeth Sensitive, and What Can I Do About It?

“Why does that one tooth hurt when I drink cold water?”

“I can’t eat ice cream without getting a sharp pain.”

“I’ve been using sensitive toothpaste, and it’s still not improving.”

Tooth sensitivity is one of the most common concerns we hear from patients at Knights Dental. For some, it’s an occasional twinge. For others, it’s something they’ve been putting up with for months because they assume it’s normal, or that everyone experiences it.

The reality is that sensitive teeth can happen for lots of different reasons. Sometimes it’s simply exposed dentine. Other times, it may be a sign of tooth wear, gum recession, a cracked tooth, a failing filling, or tooth decay.

One of the most important things to understand is that sensitivity isn’t a diagnosis in itself. It’s your body’s way of telling you that something has changed. The challenge is working out what’s causing it.

Not all tooth sensitivity feels the same

When patients come to see us with sensitive teeth, one of the first things we ask is what the discomfort actually feels like.

Does it affect one tooth or several?

Is it triggered by cold drinks, hot drinks, or sweet foods?

Does the pain disappear immediately, or does it linger afterwards?

These details can tell us a great deal.

A brief twinge across several teeth is often linked to exposed dentine or gum recession. However, sensitivity that suddenly develops in one tooth, becomes more intense, hurts when you bite, or lingers after eating or drinking often needs further evaluation.

Many patients are surprised to learn that two people can experience similar symptoms but have completely different underlying causes.

What could be causing your sensitivity?

There isn’t one single explanation for sensitive teeth.

In practice, the most common causes we see include:

Exposed dentine

The protective enamel covering your teeth can become thinner over time, while gums can naturally recede as we age. When this happens, the dentine underneath becomes exposed.

Because dentine contains thousands of tiny channels leading towards the nerve of the tooth, cold, heat, and sweetness can trigger that familiar sharp sensation.

For many patients, this is the cause of everyday sensitivity.

Gum recession

Patients often tell us they’ve noticed their teeth looking slightly longer than before or that sensitivity seems to be concentrated near the gum line.

When gums recede, the root surface becomes exposed. Unlike the visible part of the tooth, the root isn’t protected by enamel, which makes it far more vulnerable to sensitivity.

This is one reason regular hygiene appointments are so important. They allow us to monitor subtle changes before they become uncomfortable or lead to bigger problems.

Tooth wear

A question we often ask patients is what they’re drinking throughout the day.

Frequent exposure to acidic drinks, sparkling water, fruit juices, sports drinks, and even seemingly healthy options can gradually soften and wear away enamel over time.

Grinding, clenching, and everyday wear can also contribute.

Many people don’t notice tooth wear developing because it happens gradually, but sensitivity can often be one of the first signs that something is changing.

Decay, cracks or damaged fillings

If you’ve noticed one specific tooth becoming sensitive, particularly if it has happened quite suddenly, there may be a more localised cause.

Small areas of decay, cracks and failing fillings can all allow stimuli to reach the inner part of the tooth more easily.

This is why we generally advise against assuming that all sensitivity can be treated with a different toothpaste. If there is damage to the tooth itself, the underlying issue needs addressing.

Grinding and clenching

Many patients don’t realise they grind their teeth until we spot the signs during an examination.

Grinding can place considerable pressure on the teeth and may lead to wear, sensitivity and sometimes jaw discomfort.

You might notice flattened tooth edges, morning headaches or aching jaw muscles alongside sensitive teeth.

Recent whitening treatment

Some degree of temporary sensitivity can occur during or shortly after teeth whitening.

This is usually short-lived and settles once treatment has finished. However, if your teeth were already sensitive before whitening, it’s important to mention this to your dentist rather than simply trying to push through the discomfort.

“I’ve tried sensitive toothpaste, and it still hurts”

This is something we hear regularly.

Sensitive toothpastes can be very effective when exposed dentine is the underlying cause. They work by helping reduce the transmission of sensations through the dentine and, for many people, provide significant relief when used consistently.

However, sensitive toothpaste cannot repair decay, fix a crack, replace a failing filling, or treat an underlying infection.

That’s why some patients see little improvement despite trying several different products. The problem isn’t necessarily the toothpaste. It may simply be treating the wrong cause.

When sensitivity may need more than home care

While mild sensitivity often improves with a suitable toothpaste and good oral hygiene, certain symptoms are worth getting checked.

We would recommend booking an appointment if:

• one tooth is noticeably more sensitive than the others
• sensitivity has appeared suddenly
• pain is becoming more frequent or more intense
• discomfort continues after hot or cold foods have been removed
• you experience pain when biting
• a filling, crown, or tooth appears damaged
• symptoms developed following an injury
• swelling or persistent toothache is present

In these situations, it’s important to understand what’s causing the symptoms rather than simply trying to manage them.

Getting answers instead of guessing

One of the most reassuring things patients tell us after a sensitivity assessment is that they finally know what’s going on.

Sometimes we find a simple explanation and can offer advice to help reduce the discomfort. In other cases, we identify an issue early before it becomes more complicated or expensive to treat.

During an examination, we’ll look at your teeth, gums, existing restorations, and any signs of wear. Where appropriate, we may recommend radiographs to help build a clearer picture of what’s happening beneath the surface.

Most importantly, we’ll explain what we’ve found, what it means, and whether any treatment is actually needed.

Don’t ignore changes in your teeth

Sensitive teeth are often straightforward to manage, particularly when exposed dentine is the cause. But sensitivity that changes, worsens, starts affecting one tooth, or doesn’t respond to home care shouldn’t simply be ignored.

If you’re finding yourself avoiding certain foods, drinking through a straw, chewing on one side of your mouth, or wondering why the sensitivity hasn’t gone away, it’s worth having it checked.

At Knights Dental, we help patients every day who are experiencing tooth sensitivity. Rather than leaving you to guess what’s causing the problem, we can identify the underlying issue and recommend the most appropriate next step for your long-term oral health.