How Long Does It Take to Fill a Cavity? What to Expect

If you have been told you need a filling — or you suspect you might — one of the first questions that often comes to mind is how long the appointment will take. It is a practical concern, especially if you are fitting treatment around work, childcare, or other commitments. The honest answer is that cavity filling appointments vary in length depending on several factors, including the size of the cavity, where it is in your mouth, and the type of filling material used. This guide explains what influences appointment duration and what you can realistically expect. This information is intended as general guidance and does not replace personalised advice from your dentist.

How Long Does a Typical Cavity Filling Take?

General appointment length ranges

Most routine tooth filling treatment London appointments are relatively short procedures. A straightforward filling on a single tooth — where the cavity is small to moderate in size — is generally completed within a standard appointment slot. However, it is important to understand that no two fillings are identical, and your dentist will take the time needed to complete the work carefully rather than rush to finish within a set number of minutes.

Why times can differ between patients

Even two patients with similarly sized cavities may find their appointment lengths differ. Factors such as how easily the tooth can be accessed, whether additional anaesthetic is needed, and how the bite needs to be adjusted after the filling is placed can all influence overall treatment time. Your dentist will always prioritise getting the filling right over finishing quickly.

Single vs multiple fillings

If you need more than one filling, your dentist may suggest treating multiple teeth in the same appointment — particularly if they are in the same area of the mouth. This is often more convenient, but it does extend the overall appointment length. For fillings in different quadrants of the mouth, or if you prefer shorter sessions, your dentist may recommend spreading the treatment across separate visits.

What Factors Affect How Long a Filling Takes?

Size and depth of the cavity

This is one of the biggest variables. A small, shallow cavity on a smooth surface of a tooth requires less preparation and less filling material than a deep cavity that extends close to the nerve. Deeper cavities may also require more careful decay removal and additional steps to protect the underlying tooth structure, which naturally adds time to the procedure.

Tooth location (front vs back teeth)

Front teeth are generally more accessible and easier to work on than back teeth (molars and premolars). Back teeth often have more complex shapes, multiple surfaces affected by decay, and can be harder to reach — all of which can influence how long the filling takes. Molars also bear more biting force, so the filling needs to be shaped and adjusted carefully to ensure a comfortable bite.

Filling material used

The type of filling material can affect appointment duration. Composite (tooth-coloured) fillings are placed in layers, with each layer hardened using a curing light — this layering technique takes a little more time but allows the dentist to build up the filling precisely. Amalgam fillings are placed differently and may have a slightly different workflow. Your dentist will discuss material options with you before treatment begins.

Patient comfort and bite adjustments

Your comfort is always a priority. If additional time is needed to ensure the anaesthetic is working fully, or if you need a pause during treatment, your dentist will accommodate that. After the filling is placed, checking and adjusting the bite is an essential final step — making sure the filling feels smooth and that your teeth come together comfortably. This process is done carefully and methodically, and it is well worth the time it takes.

What Happens During a Cavity Filling Appointment?

Examination and preparation

Your appointment typically begins with the dentist reviewing the tooth and confirming the treatment plan. Local anaesthetic is administered to numb the area, and a few minutes are allowed for it to take full effect. This preparation phase ensures you are comfortable before any work begins.

Removing decay

Once the area is numb, the decayed portion of the tooth is carefully removed using a dental handpiece. The aim is to remove all the softened, infected tooth material while preserving as much healthy tooth structure as possible. The cavity is then cleaned and prepared to receive the filling material. You may be aware of vibration and pressure during this stage, but you should not feel pain.

Placing and shaping the filling

The filling material is placed into the prepared cavity and shaped to match the natural contours of the tooth. For composite fillings, this involves applying the material in layers and curing each layer with a specialised light. The filling is then trimmed, adjusted, and polished so that it feels smooth and your bite is comfortable. Your dentist will ask you to bite down on articulating paper to check the contact points and make any necessary adjustments.

Does the Type of Filling Change the Time Needed?

Composite (tooth-coloured) fillings

Composite fillings are the most commonly placed type of filling in modern dental practice. The layering and light-curing technique they require means they may take a little longer to place than some alternatives, but the result is a natural-looking restoration that bonds directly to the tooth. The additional time is invested in building up the filling precisely and achieving a good aesthetic and functional result.

Amalgam fillings

Amalgam (silver-coloured) fillings have been used for many decades and are placed using a slightly different technique. They do not require light curing, which can make the placement process somewhat quicker. However, amalgam fillings take longer to set fully after placement, which may affect post-treatment eating guidance. Your dentist will explain the pros and cons of each material option.

Temporary fillings

Temporary fillings are sometimes placed as a short-term measure — for example, between appointments in a course of treatment. They are designed to protect the tooth temporarily and are generally quicker to place than permanent fillings. However, they are not as durable and will need to be replaced with a permanent restoration at a follow-up appointment.

Is the Procedure Painful or Uncomfortable?

Sensation vs pain clarification

One of the most common concerns patients have is whether a filling will hurt. With modern anaesthetic techniques, the procedure itself should not be painful. However, it is important to understand that numbness does not mean you will feel nothing at all — you may be aware of pressure, vibration from the handpiece, and the sensation of water and air being used during the procedure. These sensations are normal and are not the same as pain.

Numbness and comfort measures

Local anaesthetic is administered before the procedure begins, and your dentist will wait until it has taken full effect before starting. If at any point during treatment you feel uncomfortable, a simple hand raise is usually all that is needed for the dentist to pause and check in with you. Your comfort and wellbeing are always the priority.

Individual sensitivity differences

Every patient is different. Some people find dental procedures entirely comfortable with standard anaesthetic, while others may be more sensitive or anxious. Let your dentist know how you are feeling — they can adjust their approach, explain each step as they go, and ensure you feel as comfortable as possible throughout. Maintaining regular hygiene appointments in London also helps keep your teeth in good condition, which can make future treatments more straightforward.

Can You Return to Normal Activities Afterwards?

Eating and chewing guidance

With composite fillings, the material is set before you leave the chair, so there is no need to wait for it to harden. However, if local anaesthetic was used, it is best to wait until the numbness wears off before eating — this helps avoid accidentally biting your cheek, lip, or tongue. Once sensation returns, start with softer foods and ease back into your normal diet as comfort allows.

Temporary sensitivity

Some mild sensitivity after a filling is common, particularly to cold, pressure, or sweet foods. This usually settles within a few days to a couple of weeks. Deeper fillings may take a little longer to feel completely comfortable. If sensitivity is gradually improving, that is generally a reassuring sign.

Short-term aftercare tips

Continue brushing and flossing as normal, being gentle around the treated tooth for the first day if it feels tender. Avoid extremely hot or cold food and drinks initially if you notice temperature sensitivity. If anything feels rough, uneven, or if your bite does not feel quite right, contact your dentist — a simple adjustment is usually all that is needed.

When Might a Filling Take Longer Than Expected?

Deeper decay

If the cavity is deeper than initially anticipated — which can sometimes only be fully determined once the decay is being removed — the appointment may take longer. Your dentist may need to place a protective liner over the deeper part of the tooth before filling, or take additional care to avoid the nerve. In rare cases, the extent of the decay may mean a different type of restoration is more appropriate, which your dentist will discuss with you at the time.

Bite adjustments

Getting the bite right is an essential part of any filling appointment. If the filling initially sits slightly high, it can cause discomfort when chewing. Your dentist will take the time needed to check and adjust the bite carefully — this is a normal part of the process and contributes to the long-term comfort and success of the filling.

Multiple teeth treated

Treating more than one tooth in the same appointment is often convenient, but it will extend the overall time. Your dentist will let you know in advance if they plan to address multiple fillings in one session, so you can allow enough time. If you experience any persistent discomfort after treatment, or if the issue feels more urgent, you can always seek dental pain assessment London for prompt advice.

Need a Cavity Checked in London?

If you think you may have a cavity, or if you have been told you need a filling and want to know what to expect, the best starting point is a thorough examination. Cavities are not always visible or painful — particularly in the early stages — which is why routine dental check-ups London are so important. Early detection often means simpler, quicker treatment.

At the Cosmetic Dentistry Clinic in South Kensington, we take the time to explain each step of your treatment, answer your questions honestly, and ensure you feel comfortable and informed throughout. We take the time to explain each step, answer your questions, and ensure you feel comfortable and informed — with care tailored to your individual needs.

If you would like to have a tooth assessed or are ready to book your filling appointment, you are welcome to book a dental appointment London. Our team is here to help you understand your options and plan your treatment with a clear understanding of your options.