A composite filling appointment usually takes thirty to forty-five minutes from the moment you sit down to the moment you stand up. Most patients are surprised how routine the whole process feels.
If you’ve been told you need one and you’d like to understand what’s actually happening at each stage, what follows is the procedure as we run it. The same approach applies whether you’re booked in for a single small filling or a slightly larger composite restoration at our Westcliff practice.
Before the Appointment: What We Already Know
By the time you’re in the chair for a filling, the diagnosis is already done. The tooth has been examined, often X-rayed, and we know roughly how deep the cavity goes and which surfaces are affected.
That matters because it shapes everything that follows.
A small fissure cavity on a back tooth might need only fifteen minutes of actual drilling and shaping. A larger cavity that involves two or three surfaces, particularly between teeth, will take longer and use more material. We’ll have flagged this at the check-up, and your appointment length will reflect it.
It’s worth checking whether you’re booked for one filling or several. Patients sometimes assume they’re getting two done in a single visit when only one is scheduled. Ask reception if you’re unsure.
Step 1: Numbing the Tooth
Almost every filling deeper than superficial enamel needs local anaesthetic. We apply a topical numbing gel to the gum first, wait a minute or two, then deliver the local anaesthetic injection. The discomfort from a well-administered injection is brief, usually a sting that fades within seconds.
The numbing itself takes about five to ten minutes to take full effect. We’ll test it gently before starting any drilling, and we won’t begin until you confirm you can’t feel sharp sensation.
In our experience, the most common reason a patient feels something during a filling is that we’ve started slightly too soon. We’d rather wait an extra two minutes than rush this stage.
Worth knowing: if you have any anxiety about the injection itself, mention it before you sit down. We can use additional topical, slower delivery, and various techniques that make a real difference. Patients who tell us upfront tend to have a much smoother appointment than patients who try to tough it out.
Step 2: Isolating the Tooth
Composite is fussy about moisture. Saliva, blood, or even breath condensation on the tooth surface during the bonding stage will compromise the seal between the filling and the tooth, and that compromised seal is the most common reason fillings fail early.
So before any drilling starts, we isolate the working area. This is sometimes done with a rubber dam, a thin sheet of latex or non-latex material that clips around the tooth and keeps everything else out, or with absorbent pads and high-volume suction.
The rubber dam looks dramatic and feels slightly odd, but it makes the procedure faster and the result more reliable. Most patients adjust to it within a minute or two.
Step 3: Removing the Decay
This is the stage most people associate with the appointment, the drill. The high-speed handpiece removes only the decayed enamel and dentine, leaving healthy tooth structure in place. We use a slower handpiece for the deeper, more delicate work close to the pulp.
We’re aiming for a clean cavity. Stained but firm dentine is sometimes left behind deliberately if removing it would risk exposing the nerve. We then chemically clean the cavity with a mild antibacterial solution, dry it carefully, and assess the depth.
If the cavity is very deep, we may place a thin liner over the deepest part to protect the pulp. This is a calcium-based or glass-ionomer material, and it provides a buffer between the composite and the nerve.
Not every filling needs one. Most don’t.
Step 4: Bonding and Layering the Composite
This is the part that distinguishes composite from older filling materials. We etch the cavity with a mild acid gel, which microscopically roughens the enamel surface and opens the dentine tubules. The etch is rinsed off thoroughly, and a bonding agent is brushed into the cavity and cured under a blue light.
The composite itself is placed in layers, typically two-millimetre increments, with each layer cured under the light before the next is added. Curing takes about ten to twenty seconds per layer. The light hardens the resin almost instantly.
Layering matters because it controls the shrinkage that all composites undergo as they cure. Place too much at once, and the shrinkage stress can pull the filling away from the tooth wall, creating a gap that lets bacteria back in.
This is one of the reasons a careful composite filling takes longer than people expect. The layering is methodical, and rushing it shows up later as marginal staining or sensitivity.
Step 5: Shaping the Bite and Polishing
Once the final layer is cured, we shape the filling to match the tooth’s anatomy, the cusps, the grooves, the contact with the adjacent tooth. You’ll then bite on a thin strip of articulating paper, which marks any high spots, and we’ll adjust until your bite feels even.
The polishing stage uses fine rubber points and discs to give the surface a smooth, lustrous finish. A well-polished composite is harder to stain and easier to keep clean.
That said, the bite check is the part patients sometimes don’t take seriously enough. Tell us if anything feels high, even slightly. A filling that sits a fraction of a millimetre too tall will cause discomfort within hours and can cause cracked-tooth symptoms within weeks.
Composite Filling Procedure: Time and Stages
| Stage | What Happens | Approximate Time |
|---|---|---|
| Numbing | Topical gel, then local anaesthetic injection | 5 to 10 minutes |
| Isolation | Rubber dam or absorbent pads placed | 2 to 5 minutes |
| Decay removal | Drilling and cleaning the cavity | 5 to 15 minutes |
| Etching and bonding | Acid etch, rinse, bonding agent, cure | 3 to 5 minutes |
| Composite placement | Layered placement and curing | 10 to 20 minutes |
| Shaping and polishing | Bite adjustment and finishing | 5 to 10 minutes |
The total time varies. A small one-surface filling can be done in twenty minutes once the patient is numb. A larger, multi-surface restoration might take forty-five minutes or a little more.
After the Appointment
The numbness wears off over two to three hours. We’d recommend avoiding hot drinks and chewing on the numb side until sensation returns, mostly to avoid biting your cheek or lip without realising.
Mild sensitivity to cold for a few days is normal, particularly if the cavity was deep. It usually settles within a week. Sensitivity that increases rather than decreases, or that becomes spontaneous, isn’t normal, and you should call us.
You can eat as soon as the numbness has worn off. Composite fillings are fully cured by the time you leave the chair, so there’s no waiting period for the material to set.
You’ll find articles online suggesting you should avoid hard foods for twenty-four hours after a filling. In our experience, that’s overly cautious for composite. The material is at its full strength immediately. Common sense applies, no chewing ice or cracking nuts directly on a fresh restoration, but normal eating is fine.
Cost and What’s Included
Under the NHS, fillings fall under Band 2, currently £76.60 in England. That fee covers all the fillings you need within a single course of treatment, regardless of number, along with the examination, X-rays, and any other Band 2 work needed at the same visit. The full current banding is published on the NHS dental costs page. NHS treatment is free for under-18s in England, or under 19 in full-time qualifying education.
For more on the materials used and how composites compare with other restorative options, the Wikipedia entry on dental composites is a reasonable starting point.
If you’ve got a filling appointment coming up at our practice, or you’d like to discuss replacing an older one, we’d be happy to walk you through what we’d recommend for your specific tooth. Westcliff Dental Practice takes appointments by phone on 01702 344 500, and the front-of-house team can usually find something within the week.
