If your teeth have always been slightly sensitive, you probably know which foods or drinks tend to trigger it. A new or noticeable increase in sensitivity is different.

Perhaps one tooth suddenly reacts to cold water. You might have started avoiding hot drinks, or noticed discomfort when biting that was not there a few months ago. Changes like these can provide useful clues about what is happening to a tooth.

At FACEMED in Billericay, Essex, we would not look at sensitivity in isolation. The important question is what has changed to make the tooth more sensitive now? Here are seven possibilities.

1. Are Your Gums Starting to Recede?

A tooth can become more sensitive when the gum moves down and exposes part of its root. Root surfaces do not have the same protective enamel covering as the visible crown, so they can react more readily to cold, touch and brushing.

Recession may affect one tooth or several and can have different causes, including gum disease. We look more closely at these causes in our guide to why gums recede.

If the gums are inflamed or there are signs of periodontal disease, managing gum health becomes the priority. At FACEMED, our Dental Hygiene Therapy can include the professional removal of plaque and calculus, alongside advice on cleaning effectively around areas of recession. Where appropriate, the hygienist can also apply fluoride treatments or varnishes to help desensitise the teeth.

2. Could You Be Wearing Away Your Teeth?

Sensitivity can develop gradually as the protective tooth surface becomes worn.

One cause that is easily overlooked is bruxism, or teeth grinding and clenching. Repeated pressure can wear down the biting surfaces, contribute to chips or cracks and leave teeth increasingly vulnerable.

Some patients do not realise that they grind their teeth until wear or sensitivity is identified during an examination. Our guide to teeth grinding and jaw tension explains some of the other signs that can accompany bruxism.

The important part is identifying the pattern of wear rather than repeatedly repairing individual teeth without considering why the damage is occurring. Where tooth structure has already been affected, we may also need to consider restorative treatment to protect vulnerable areas.

3. Could a Filling or Tooth Have Become Damaged?

Sensitivity in one particular tooth deserves attention, especially if that tooth has previously been restored.

Fillings and teeth are subjected to considerable pressure every day. A damaged restoration, chip or crack can allow temperature changes to reach more sensitive parts of the tooth. You may notice pain when biting, releasing your bite or eating something cold.

For relatively small areas of damage, we may use a White Filling to replace lost or compromised tooth structure and reseal the affected area. If more of the tooth has been weakened, greater structural protection may be required.

This is one reason small dental problems are worth identifying early. As we explain in our guide to addressing small dental problems before they progress, cracks, wear and early decay do not necessarily cause significant pain straight away.

4. Could New Sensitivity Be an Early Sign of Tooth Decay?

Decay does not always begin with toothache. A tooth becoming increasingly sensitive to cold or sweet foods can sometimes be an earlier indication that its structure has been compromised.

Where decay is relatively limited, a White Filling may be used after the affected tooth tissue has been removed. The filling restores and seals the area, helping to protect the remaining tooth structure.

At FACEMED, we can also use Laser Dentistry in appropriate cases when treating decay and preparing a tooth for a filling.

Which approach is suitable depends on the location and extent of the decay. Treating the problem while it remains relatively localised may help prevent it from progressing towards the pulp at the centre of the tooth.

5. Why Have My Teeth Become Sensitive After Whitening?

A short period of increased sensitivity can occur with teeth whitening, but that does not mean all sensitivity during whitening should automatically be ignored.

We provide both Professional Home Whitening and Whitening BlancOne at FACEMED. Temporary sensitivity can occur with either approach, although BlancOne uses a low-concentration whitening formulation designed to minimise sensitivity.

If you already have sensitive teeth, tell your dental team before starting. If one tooth reacts much more strongly than the others, or discomfort persists, it may be appropriate to investigate further. A cavity, damaged restoration or another underlying problem can sometimes become more noticeable during whitening.

6. Can a Sensitive Tooth Mean the Nerve Is Inflamed?

The way a tooth responds can be just as informative as what triggers it.

A quick sensation that disappears when you stop drinking something cold is different from pain that continues afterwards. Sensitivity that begins spontaneously, becomes increasingly intense or starts waking you at night can suggest that the pulp inside the tooth is becoming affected.

Deep decay, trauma and cracks can all compromise this tissue.

If the pulp becomes irreversibly damaged or infected but the tooth can still be saved, we may recommend Root Canal Treatment. The affected tissue is removed from inside the tooth, the root canal system is cleaned and sealed, and the tooth is restored. The aim is to address infection or inflammation while preserving the natural tooth where this remains a predictable option.

7. What If Sensitivity Is Turning Into Toothache?

There is a point at which what feels like “sensitivity” may actually be developing into a more significant dental problem.

Pay particular attention to a tooth that becomes painful without eating or drinking, hurts when you bite, develops persistent throbbing pain or is accompanied by swelling.

In more advanced cases, the first question is whether the tooth can be predictably restored. Root Canal Treatment may allow an infected tooth to be retained. Where a tooth is too extensively damaged or cannot be predictably saved, Tooth Extraction may need to be considered.

For problems such as persistent toothache, dental infection, broken teeth and lost fillings or crowns, our Emergency Dentistry service allows the problem to be assessed promptly and the appropriate next step determined.

How Can I Tell Whether Sensitive Teeth Need a Dentist?

Think about what has changed.

Sensitivity is worth investigating when:

• one tooth has suddenly become sensitive
• discomfort is becoming stronger or more frequent
• pain lingers after eating or drinking
• the tooth hurts when you bite
• you can see a chip, crack or damaged filling
• sensitivity has developed into spontaneous toothache
• there is swelling around the tooth or gum

At FACEMED, the aim is to identify the source before deciding what, if anything, needs treating. Gum inflammation may point towards Dental Hygiene Therapy, while decay or a damaged area of tooth could require a White Filling. A problem affecting the pulp may require Root Canal Treatment.

Sometimes more than one issue needs addressing, particularly when tooth wear, gum recession or grinding is contributing to the sensitivity.

FAQs About Changes in Tooth Sensitivity

Why has one tooth suddenly become sensitive?

Sensitivity isolated to one tooth can be associated with localised problems such as decay, a crack, damage to a restoration or changes within the pulp. A dental examination is needed to distinguish between them.

Can teeth become more sensitive as they wear down?

Yes. As protective tooth structure is gradually lost, the underlying dentine can become less well insulated. This can be particularly relevant when there is evidence of grinding or clenching.

Should I worry if a sensitive tooth starts hurting when I bite?

Pain on biting is worth having assessed because it can indicate a structural or internal problem with the tooth. It is particularly important if the symptom is new or getting worse.

What Does It Mean If Sensitivity Lingers After a Cold Drink?

Dentists pay attention to how long pain continues after the trigger has gone. Lingering or increasing pain can require further investigation to determine whether the pulp inside the tooth is affected.

Have a Change in Tooth Sensitivity Checked in Essex

A tooth becoming more sensitive does not automatically mean that something serious is wrong, but a clear change is worth paying attention to.

At FACEMED in Crays Hill, Billericay, we can assess the pattern of sensitivity alongside the health of the tooth and surrounding gums. This allows us to match any treatment to the underlying cause, whether that means improving gum health, repairing a damaged area or treating a problem deeper within the tooth.

If you have noticed new, persistent or worsening tooth sensitivity, you can book a dental consultation at FACEMED for an assessment.