If you’ve recently had a cavity filled and are now noticing some sensitivity, you’re not alone — and it’s usually nothing to worry about. In fact, mild tooth sensitivity after a filling is quite common, especially when the cavity was deep or close to the nerve.
But how do you know if the sensitivity is normal — or if something needs attention?
Let’s explore why fillings can cause sensitivity, how long it typically lasts, and when it’s time to call your dentist.
🦷 Why Might a Tooth Feel Sensitive After a Filling?
Tooth sensitivity after a filling can happen for a few reasons:
- ✅ 1. Irritated Nerve
When a cavity is deep, the decay is close to the inner nerve of the tooth. Even after removing the decay and placing a filling, the nerve may remain temporarily inflamed, resulting in sensitivity to: - Cold drinks or air
- Sweet or acidic foods
- Biting pressure
- ✅ 2. Bite Misalignment
If your new filling is slightly too high, it can change your bite and put excess pressure on that tooth. This can cause soreness or sharp pain when chewing. Your dentist can easily fix this with a quick adjustment. - ✅ 3. Filling Material
Some patients are more sensitive to certain materials: - Tooth-coloured composite fillings may conduct temperature differently than your natural tooth
- Silver amalgam expands and contracts with temperature changes, which can trigger sensitivity, especially early on
- ✅ 4. Exposed Dentin
If the filling doesn’t fully seal the area or if neighbouring enamel is thin, the underlying dentin layer (which contains tiny nerve endings) may be exposed, leading to short bursts of pain or discomfort.
⏱ How Long Does Sensitivity Last After a Filling?
- Mild sensitivity: Usually lasts a few days to a week
- Deeper fillings: May cause intermittent sensitivity for up to 2–3 weeks
If your symptoms are gradually improving, that’s a good sign of healing.
If the sensitivity lingers beyond 3–4 weeks, or if the pain worsens, it’s best to book a check-up to rule out other issues like:
- A cracked tooth
- A leaking or poorly bonded filling
- A nerve that’s not healing properly and may need root canal treatment
🔍 When to Contact Your Dentist
Call your clinic if:
- Pain is sharp, constant, or getting worse
- You feel pain when biting or chewing (especially one-sided)
- The sensitivity lasts longer than 3–4 weeks
- There’s swelling, a bad taste, or signs of infection
Your dentist may recommend adjusting the filling, replacing it, or exploring further treatment if the nerve is damaged.
💡 How to Manage Sensitivity at Home
While your tooth is healing, you can try:
- Using a sensitivity toothpaste (like Sensodyne® or Colgate Sensitive Pro-Relief™)
- Brushing gently with a soft-bristled toothbrush
- Avoiding extremely hot or cold foods for a few days
- Rinsing with warm salt water to reduce inflammation
- Avoiding hard, sticky, or very sweet foods that may aggravate the tooth
Most importantly — keep brushing and flossing! Good oral hygiene helps your tooth heal and prevents future cavities.
Final Thoughts
Yes — fillings can cause temporary tooth sensitivity, especially in the days or weeks after the procedure. In most cases, this is a normal part of the healing process and should improve on its own. But if the pain continues or feels “off,” don’t hesitate to reach out to your dental team.
Still feeling sensitive after your filling? Let’s take a closer look. Our team is here to ensure your restoration feels comfortable and functions properly. Book a follow-up appointment if you’re concerned — we’re happy to help you feel at ease.