Some sensitivity after a filling is normal. Most of it settles within two to three weeks, and the majority of patients are back to entirely comfortable within a month. If you’ve had a recent filling and the tooth still twinges with cold drinks or biting pressure, it’s almost always within the range of expected post-treatment recovery, but there are a few specific scenarios where sensitivity points to something that needs adjusting. Understanding the difference is what makes the next two weeks much less worrying.
Why Sensitivity Happens at All
The act of placing a filling, however carefully done, involves drilling close to the pulp (the nerve tissue in the centre of the tooth). The pulp responds to that with a low-grade inflammation that can take days or weeks to settle. The deeper the cavity, the closer the drilling came to the pulp, and the more inflammation tends to result. None of this means anything has gone wrong. It’s the normal response to having had work done.
The composite material itself can also contribute. Composite shrinks slightly as it sets, and even with careful layering and bonding, microscopic stresses on the underlying tooth can produce short-term sensitivity. This typically resolves as the tooth’s pulp settles down.
Worth knowing: amalgam fillings, when they were more common, also produced post-operative sensitivity, often through different mechanisms (thermal conductivity, microleakage). The phenomenon isn’t unique to composite.
The general clinical context for restorative work and recovery is summarised in the overview of dental restoration, which is a useful primer if you’d like the broader picture.
What Normal Sensitivity Feels Like
To put it precisely: a sharp but brief response to cold drinks or cold air, a slight twinge when biting on something hard, a mild ache for the first day or two as the anaesthetic wears off. All of these are within the range of normal.
Cold sensitivity, in particular, is the most common and most reassuring kind. It indicates the pulp is still alive and responsive. A tooth that no longer responds to cold at all, after a filling, is sometimes a more concerning sign than one that responds briefly.
What’s also normal:
- Sensitivity that lasts a few seconds and stops when the trigger is removed
- Sensitivity that decreases noticeably over the first one to two weeks
- A slightly different feel when biting, particularly in the first week
- Tenderness in the gum next to the tooth, especially if rubber dam was used
- Mild jaw ache from holding the mouth open during the appointment
If your sensitivity falls into any of these categories, we’d generally suggest waiting a fortnight before getting in touch.
When to Get Back in Touch
Some symptoms warrant an earlier review. The list below is what we’d want to hear about.
- Sharp pain on biting that doesn’t improve over the first week (often a high spot in the bite)
- Lingering pain after the cold trigger is removed (lasts more than 30 seconds)
- Spontaneous throbbing pain, particularly at night when lying down
- Heat sensitivity (much rarer, more concerning than cold sensitivity)
- Sensitivity that’s getting worse rather than better past the two-week mark
- The filling feels visibly high or rough when you run your tongue over it
- Swelling, bad taste, or any sign of infection
The first one on that list is the most common reason patients come back, and it’s the easiest to fix. A filling that sits even slightly proud of the surrounding tooth surface gets hit harder than expected when biting, which causes pain that mimics nerve damage. A two-minute bite adjustment usually sorts it.
It’s common for patients to assume that if they’re having pain, the filling has “failed” and needs replacing entirely. Not usually the case.
The High Spot Problem
This deserves its own section because it accounts for so many of the concerned phone calls we receive in the days after a restoration.
When a filling is placed under local anaesthetic, the patient can’t feel the bite the way they normally would. We check the bite with articulating paper (the blue or red marking paper) and adjust accordingly, but the anaesthetic temporarily numbs proprioception (the sense of how teeth meet). It’s possible for a filling to feel fine in the chair and then feel high once the numbness wears off and you’re eating normally.
If a filling sits even a fraction of a millimetre proud, the tooth absorbs disproportionate force on every bite. The pulp reacts to that with inflammation, the inflammation produces pain, and the pain feels exactly like nerve damage. It isn’t.
The fix is a quick check and adjustment with articulating paper. We don’t even usually need anaesthetic for this. Five minutes in the chair, and most patients are sorted.
If you have biting sensitivity that hasn’t improved by day five, ring us. Don’t suffer through it.
Sensitivity Timeline at a Glance
The following table sets out a rough expected timeline. Individual experiences vary, and this is a guide rather than a guarantee.
| Time After Filling | Expected Sensation | What’s Happening |
|---|---|---|
| First few hours | Numbness fading, mild ache | Local anaesthetic wearing off |
| Day 1–3 | Cold sensitivity, mild biting tenderness | Pulp inflammation peaks |
| Day 4–7 | Cold sensitivity decreasing, biting normal | Inflammation beginning to settle |
| Week 2 | Occasional mild twinge with cold | Continued resolution |
| Week 3–4 | Tooth feels normal | Pulp recovery essentially complete |
| Beyond 4 weeks | Persistent sensitivity should be reviewed | May indicate high bite or deeper issue |
If your timeline matches this pattern, you’re tracking through normal recovery.
What You Can Do at Home
For the first week or so, a few practical things help.
- Avoid extremes of temperature with that tooth (no ice-cold drinks, no piping-hot soup)
- Chew on the other side if biting is uncomfortable
- Use a sensitive-formula toothpaste (those with potassium nitrate or stannous fluoride)
- Avoid hard or sticky foods on the restored tooth
- Continue brushing and flossing normally (the area needs to be clean)
- Take paracetamol or ibuprofen at standard doses if needed for the first few days
Sensitive toothpaste isn’t a quick fix. It builds up effect over two to three weeks of daily use. Worth starting it the day of the filling and continuing for a month or so.
The NHS overview of dental fillings covers the general aftercare picture if you’d like a second source.
The Less Common Outcome: Pulpitis That Doesn’t Settle
In a small minority of cases, sensitivity progresses rather than resolves. The pulp inflammation, instead of settling, becomes irreversible. This is more likely when the original cavity was deep and close to the nerve, when the tooth was already symptomatic before the filling, or occasionally for reasons that aren’t fully predictable.
The signs are spontaneous pain (pain without a trigger), pain that wakes you at night, lingering pain after cold or hot stimuli, and a general escalation rather than resolution. If those describe your experience past the two to three week mark, the tooth may need root canal treatment or, in some cases, extraction.
That outcome is uncommon, particularly with smaller fillings. With deeper restorations, it’s a known risk, and we’d usually mention it at the time of treatment. In our experience, patients prefer to know about it upfront rather than be blindsided weeks later.
The honest truth: sometimes a tooth that looked restorable from the X-ray turns out, once the decay is fully removed, to have been damaged more than expected. That’s not a sign of poor treatment. It’s the inherent uncertainty of working on a structure you can only partially see beforehand.
For NHS patients in England, a follow-up adjustment within the same course of treatment is included in the original Band 2 fee. The current band fees are listed at how much NHS dental treatment costs. Privately, most practices include reasonable post-treatment adjustment without an additional charge.
Don’t wait the full month if something feels wrong. A bite check at day five or six is much better than a worsening problem at day twenty-five.
If you’ve had a recent filling and the sensitivity isn’t following the pattern above, our team at Westcliff Dental Practice in Westcliff-on-Sea is happy to take a look. A short review appointment is often all that’s needed. Call us on 01702 344 500 and we’ll fit you in.
