How Long Does a Dental Filling Take?

People asking how long a filling takes are usually asking one of two things: how much time to block out in the diary, or how long they will have to sit there.

Both are reasonable, and the answers are different, because a good proportion of the appointment is not spent doing the filling.

These are general ranges for a single tooth, and they vary with the size of the cavity, the tooth involved and the material used.

Small to moderate composite filling: around 30 to 45 minutes for the appointment.

Large composite filling involving multiple surfaces or cusp coverage: 45 to 60 minutes, sometimes longer.

Amalgam filling: somewhat quicker in the placement phase, since it does not require the incremental layering and light curing that composite does. Appointment time is often 20 to 40 minutes. Amalgam use has declined considerably in the UK following the phase-down agreed under the Minamata Convention, and most fillings now placed are tooth-coloured.

Glass ionomer or a temporary restoration: relatively quick, often 15 to 30 minutes, though these materials have specific indications rather than being a general substitute.

Two or three fillings in the same quadrant: usually more efficient than separate visits, because the anaesthetic and isolation are shared. Three small fillings might take 60 to 75 minutes rather than three separate 30-minute appointments.

Inlay or onlay, where the restoration is made in a laboratory or milled chairside: a longer first appointment for preparation and scanning, then either a fitting appointment or, with chairside milling, a wait while the restoration is produced.

Breaking down a typical 40-minute composite appointment:

Greeting, history check and examination — a few minutes. Confirming which tooth, checking the radiograph, reviewing medical history and any changes.

Discussion and consent — a few minutes. What is planned, the alternatives, the cost, and what to expect afterwards.

Local anaesthetic — administration is quick, onset is not. Infiltration in the upper jaw typically takes effect within a few minutes. An inferior alveolar nerve block for lower back teeth takes longer, commonly five to ten minutes, and occasionally requires a supplementary injection. This waiting period is a significant part of many appointments and cannot be hurried.

Isolation — a few minutes. A rubber dam is placed for many composite restorations. It keeps the tooth dry, which materially affects the quality of the bond, and it protects the airway. It adds time and is worth it.

Removal of decay — variable. This is the part that depends most on what is actually found. A small lesion is a couple of minutes; extensive decay approaching the pulp takes considerably longer and involves judgement about how much to remove.

Placing the restoration — this is where composite and amalgam differ. Composite requires etching and bonding, then placement in increments with each layer light-cured. Deeper cavities need more increments. Our article on how composite polymerisation affects strength explains why the layering matters.

Shaping, checking the bite and polishing — five to ten minutes. Adjusting the contact with the opposing tooth, checking it in lateral movements, and polishing the surface. Rushing this stage causes the problems people return with.

Aftercare instructions.

Deep decay near the nerve. Requires careful removal, possible pulp protection with a liner, and sometimes a decision about whether root canal treatment is needed instead. Our article on deep decay reaching the nerve covers this.

Difficulty achieving numbness. More common in the lower jaw and in teeth with active inflammation, where the local tissue acidity reduces anaesthetic effectiveness. Supplementary techniques may be needed.

Awkward access. Wisdom teeth and second molars, limited mouth opening, or a strong gag reflex.

Fillings between teeth. Require a matrix band and wedge to rebuild the contact point correctly, which takes longer than a filling on a biting surface and matters for gum health.

Replacing a failed restoration. Removing an old filling, assessing what is underneath, and often finding more decay than the radiograph suggested. Our article on when replacing an old silver filling may be considered covers the decision.

Cusp involvement. Where a cusp is fractured or undermined, rebuilding it takes longer and may raise the question of whether a crown or onlay is more appropriate. Our article on whether a large filling can break your tooth covers that threshold.

Anterior aesthetic work. Matching shade and translucency in a front tooth takes considerably longer than restoring a molar, because the result is visible. Our article on micro-texture and the appearance of bonding covers the finishing.

Anxiety. Requiring a slower pace, breaks, or additional reassurance. This is legitimate and should be mentioned when booking so that enough time is allocated.

A lost or broken filling can often be dealt with the same day, either definitively or with a temporary restoration to protect the tooth until a longer appointment. Our articles on what to do if a filling falls out and a broken filling with sharp edges cover the immediate steps.

Where a tooth is painful, the priority is diagnosing the cause rather than simply refilling. A tooth that hurts spontaneously or wakes you at night has a different problem from one that is merely sensitive to cold. Our emergency dentist page covers urgent care.

Numbness lasts one to four hours depending on the anaesthetic and the technique. Avoid eating on that side until sensation returns, to prevent biting the lip or cheek — a common and entirely avoidable injury, particularly in children.

Composite is fully set when you leave, so there is no waiting period before eating. Amalgam is traditionally given a few hours before heavy chewing on that side.

Some sensitivity to cold for days to a few weeks is common, particularly after a deep filling. It should reduce steadily.

A high bite is the most common reason for discomfort afterwards. If the tooth feels like it hits first, it needs a small adjustment — this takes a couple of minutes and should not be tolerated for weeks.

Persistent or worsening pain, spontaneous pain, or pain waking you at night is not normal and should be reported. It may indicate that the pulp is inflamed irreversibly.

Our white fillings page explains the material, and our article on how composite fillings restore decayed teeth covers the process.

How long does one filling take?

For a small to moderate composite filling, typically 30 to 45 minutes for the appointment, of which the actual restoration may be ten to fifteen minutes. Larger fillings take longer.

Can I have several fillings in one visit?

Usually yes, particularly if they are in the same area of the mouth, where the anaesthetic and isolation can be shared. Whether to do this depends on the number, their complexity and how comfortable you are with a longer appointment.

Why does it take so long to go numb?

An inferior alveolar nerve block for the lower back teeth takes five to ten minutes and occasionally longer. Inflamed tissue is also harder to anaesthetise. This waiting time cannot be shortened without compromising comfort.

Do I need to wait before eating?

Composite is set when you leave, so no waiting is required for the material. You should wait for numbness to wear off before eating, to avoid biting your lip or cheek.

Does a white filling take longer than a silver one?

Generally yes. Composite requires a dry field, etching, bonding and incremental placement with curing between layers, all of which add time compared with amalgam.

What if the filling feels high afterwards?

Contact the practice for an adjustment. It takes a couple of minutes and prevents ongoing discomfort and the risk of cracking the restoration or the tooth.

How long will the filling itself last?

That depends on its size, position, the material, your decay risk and your bite. Small restorations in low-risk mouths last many years; large restorations in heavy bites last less. Regular review is how deterioration is caught early.

If you have been told you need a filling and want to know how long to allow, ask when booking — the practice can give a time based on the specific tooth and the size of the lesion.

If you are anxious about the appointment, say so when booking rather than on arrival. Extra time can be allocated, which makes the visit considerably easier.

You can contact our team to arrange an appointment at our Wimpole Street practice. Our white fillings and dental check-up pages explain what is involved.

This article provides general information and does not constitute individual dental advice. Appointment times quoted are general ranges and vary considerably with the individual tooth, the extent of decay and the material used. The appropriate treatment for a given tooth can only be determined following clinical examination and, where indicated, radiographs. Wimpole Dental is regulated by the Care Quality Commission, and our clinicians are registered with the General Dental Council.

Next review due: 31 August 2027