Do White Fillings Cause Pain? What to Expect During and After Treatment

Do White Fillings Hurt?

This is one of the most common questions patients ask — and it is a completely reasonable one. If you have been told you need a filling, or you are considering replacing an old one, it is natural to wonder what the experience will feel like.

The short answer is that white filling treatment is a routine procedure, and most patients find it well tolerated. A local anaesthetic is used to numb the area, which means you should not feel pain during the procedure itself. However, it would not be honest to say that every patient feels nothing at all — experiences vary, and some people are more sensitive than others.

After the filling is placed, mild sensitivity is fairly common and usually settles within a short period. In most cases, this is a normal part of how the tooth responds to treatment — not a sign that something has gone wrong.

This guide, from our private dental clinic in South Kensington, explains what happens step by step, what you might feel during and after treatment, and when it is worth getting in touch if something does not feel right.

What Happens During a White Filling?

Understanding what happens during the procedure can help reduce anxiety. White filling treatment is one of the most commonly performed dental procedures, and most appointments are relatively straightforward.

Local Anaesthetic and Numbness

Before any work begins, your dentist will apply a local anaesthetic to numb the tooth and surrounding area. This is done to minimise discomfort during the procedure. The anaesthetic takes a few minutes to take full effect, and your dentist will check that the area is properly numb before proceeding.

The numbness typically lasts for one to three hours after the appointment, depending on the type and amount of anaesthetic used. During this time, you may find it difficult to feel your lip, cheek or tongue on that side — this is completely normal and will wear off gradually.

Removal of Decay or Damaged Tooth Structure

Once the area is numb, the dentist will carefully remove the decayed or damaged portion of the tooth. You may hear sounds from the dental instruments and feel some vibration or pressure, but you should not feel sharp pain. If at any point you feel uncomfortable, let your dentist know — additional anaesthetic can be given.

Placement and Shaping of the Filling

After the decay is removed, the tooth is cleaned and prepared. The white composite resin is then applied in layers, with each layer hardened using a curing light. The dentist shapes the filling to match the natural contours of your tooth, paying attention to how it fits with your bite.

This stage is generally comfortable — you are unlikely to feel any discomfort during the placement of the filling itself.

Bite Adjustment

Once the filling is in place, your dentist will check your bite by asking you to close your teeth together. If the filling feels slightly high, it will be adjusted until the bite feels natural. Getting the bite right is important — a filling that sits too high can cause discomfort when chewing and may contribute to sensitivity after treatment.

Does the Injection Hurt?

For many patients, the injection is the part they feel most anxious about. It is worth knowing what to expect.

What Patients Typically Feel

Most patients describe the injection as a brief pinch or mild sting that lasts only a few seconds. Some dentists apply a topical numbing gel to the gum before giving the injection, which can reduce the initial sensation. Once the anaesthetic starts to work, the area becomes numb and you should not feel pain during the rest of the procedure.

It is important to be honest: some patients do find the injection mildly uncomfortable, particularly if the area being treated is already inflamed or sensitive. However, this discomfort is short-lived and is generally well tolerated.

Why Numbness Helps

The purpose of the local anaesthetic is to block the nerve signals in the area being treated. This means that even though dental instruments are being used on or near the tooth, you should not feel pain. Some patients feel pressure or vibration, but this is quite different from pain.

If you have had a difficult experience with dental injections in the past, or if you feel particularly anxious, let your dentist know. They can take extra care, work at a pace you are comfortable with, and explain each step as they go.

Is Tooth Sensitivity Normal After a White Filling?

Yes — mild sensitivity after a white filling is a common experience and, in most cases, is not a cause for concern. Understanding why it happens can help put your mind at ease.

Sensitivity to Cold or Pressure

The most commonly reported type of post-filling sensitivity is a brief, sharp reaction to cold drinks, cold food or cold air. Some patients also notice mild sensitivity when biting down on the treated tooth. This tends to be most noticeable in the first few days after treatment and usually diminishes over time.

This happens because placing a filling involves working close to the inner layers of the tooth where the nerve sits. Even though decay has been removed and the tooth has been restored, the nerve can be temporarily irritated by the procedure itself.

Inflammation of the Tooth Nerve

When decay is removed from a tooth, particularly if the cavity was deep, the nerve inside the tooth (the pulp) can become mildly inflamed. This is known as reversible pulpitis — a temporary condition where the nerve is irritated but is expected to recover on its own.

In most cases, this inflammation settles gradually as the tooth heals. During this period, you may notice sensitivity that comes and goes, particularly in response to temperature changes. This is a normal part of the healing process, not necessarily an indication that anything is wrong.

Bite-Related Sensitivity

If the filling is slightly higher than the surrounding tooth surface — even by a fraction of a millimetre — it can cause discomfort when you bite down. This type of sensitivity tends to be consistent (rather than intermittent) and is felt specifically when chewing or closing the teeth together.

If you notice this kind of sensitivity, it is worth contacting your dentist. A small bite adjustment is a quick and straightforward procedure that usually resolves the problem immediately.

How Long Does Sensitivity After a Filling Last?

This is one of the most frequently asked questions, and the honest answer is that it varies from person to person.

Typical Short-Term Timelines

For most patients, post-filling sensitivity is mild and settles within a few days to a couple of weeks. Some patients notice very little sensitivity at all, while others find it takes a little longer for the tooth to fully settle — particularly if the filling was deep or if the cavity was large.

As a general guide:

• Mild cold sensitivity: Often noticed in the first few days and typically improves within one to two weeks.
• Sensitivity when biting: May indicate a slightly high bite — contact your dentist for a quick adjustment if it persists beyond a few days.
• Lingering sensitivity: In some cases, a tooth may take several weeks to settle fully, particularly after a deep filling. This does not always mean there is a problem, but it is worth monitoring.

Individual Variation

Every patient's experience is different. Factors that can influence how much sensitivity you experience — and how long it lasts — include:

• The size and depth of the cavity that was treated.
• How close the decay was to the nerve of the tooth.
• Whether the tooth had existing sensitivity before treatment.
• Your individual threshold for sensitivity.
• Whether the filling replaced an old restoration.

Why Some Teeth Take Longer to Settle

Deeper fillings — those that were placed closer to the nerve — tend to produce more post-treatment sensitivity. This makes sense because the nerve has been more directly affected by the procedure. In these cases, it is not unusual for the tooth to take several weeks, or occasionally longer, to feel completely normal again.

Your dentist may recommend using a desensitising toothpaste during this period, which can help reduce sensitivity over time. If the sensitivity is improving — even gradually — this is generally a positive sign.

When Should Sensitivity Be Checked?

While some sensitivity is expected and usually resolves on its own, there are situations where it is worth getting in touch with your dentist to have the tooth reassessed.

Pain When Biting

If you experience a sharp or aching pain specifically when you bite down on the filled tooth, this may indicate that the filling is slightly high and needs adjusting. This is a very common and easily corrected issue — a quick appointment to check and fine-tune the bite usually resolves it.

Sensitivity That Worsens Over Time

Post-filling sensitivity should gradually improve, not get worse. If you notice that sensitivity is becoming more intense, lasting longer, or is now occurring spontaneously (without a trigger such as cold food or biting), this is worth having checked. In rare cases, worsening symptoms can indicate that the nerve has been more significantly affected and may need further attention.

Symptoms Lasting Longer Than Expected

If sensitivity persists beyond several weeks without any sign of improvement, it is sensible to book a review appointment. Your dentist can reassess the tooth, check the bite, and determine whether any further action is needed. In most cases, simple measures resolve the issue — but it is always better to have it checked rather than to wait and worry.

Can White Fillings Cause Long-Term Problems?

White fillings are a well-established and widely used dental treatment. For the vast majority of patients, they provide a reliable and effective way to restore a damaged tooth. However, like all dental treatments, they are not without some considerations.

Rare Complications

In a small number of cases, the nerve of a tooth may not recover fully after a filling — particularly if the decay was deep. This can occasionally lead to the need for further treatment, such as root canal treatment, to address the affected nerve. It is important to emphasise that this is uncommon and is usually related to the extent of the original decay rather than the filling itself.

Other infrequent issues can include:

• A filling chipping or wearing over time, which may require repair or replacement after several years.
• Marginal staining around the edges of the filling, which can sometimes be polished or refreshed.
• Recurrent decay developing around or beneath an old filling if oral hygiene is not maintained.

Importance of Monitoring

Regular dental check-ups allow your dentist to monitor the condition of your fillings over time. Small issues — such as a slightly worn edge or early signs of wear — can often be addressed before they become larger problems. This is one of the reasons why routine dental examinations are so valuable, even when everything feels fine.

Follow-Up if Symptoms Persist

If you experience ongoing symptoms after a filling — whether sensitivity, discomfort or a change in how the tooth feels — your dentist will want to know. Early assessment means that any issues can be identified and managed promptly. In most cases, the solution is straightforward — a bite adjustment, a review of the filling, or simply reassurance that the tooth needs a little more time to settle.

When to Book a Dental Appointment

If any of the following apply to you, it is worth booking an appointment to have your tooth assessed:

• Ongoing discomfort after a recent filling: If sensitivity or pain has not improved within a couple of weeks, or if it is getting worse, a review appointment can identify the cause and provide a solution.
• You are unsure if your sensitivity is normal: It is always better to ask than to worry. Your dentist can quickly check the tooth and let you know whether what you are experiencing is part of the normal healing process.
• You need a filling and feel anxious about pain: If dental anxiety is something you experience, let your dentist know. They can explain each step, work at your pace, and help you feel as comfortable as possible during treatment.
• You would like peace of mind: Whether it is a new concern or something that has been niggling for a while, a check-up gives you clear answers and a plan if anything needs attention.

Last reviewed: February 2026. This article is for general informational purposes only and does not constitute personalised clinical advice. Pain and sensitivity vary between individuals. A thorough examination by a qualified dentist is always required before any treatment can be recommended. Individual circumstances and outcomes vary.