A sensitive tooth after a filling is common, but it can still be worrying if you’re not sure what’s causing it. If you’ve recently had a cavity filled and are experiencing discomfort, you’re not alone. Sensitivity after dental work can last for a few days or even weeks, depending on the type of filling, the depth of the decay, and how your tooth reacts to the procedure.

We’ll explain here why tooth sensitivity after a cavity filling happens, how long it should last, and when to seek help from your dentist.

When a filling is placed, your tooth undergoes some changes that can temporarily make it more sensitive. Here are the main reasons why this happens:

1. The Nerve Is Irritated
   Your teeth contain tiny nerves within the dentine layer, which lies beneath the enamel. When decay is removed, the nerve can become inflamed or irritated, especially if the cavity was deep. This can cause temporary tooth sensitivity after a filling that usually settles as the nerve heals.

2. The Filling Material Needs Time to Settle
   Some fillings, particularly composite (white) fillings, can contract slightly as they harden, creating minor gaps that expose sensitive areas. Over time, the filling bonds properly, and the sensitivity should decrease.

3. Bite Misalignment
   If your filling is even slightly too high, it can put extra pressure on the tooth every time you bite down. This can cause prolonged sensitivity and discomfort. If this happens, your dentist can adjust the filling to improve your bite.

4. Exposed Dentine or Nerve Damage
   If a tooth had significant decay, the filling may be close to the nerve. In some cases, if the nerve is too irritated, the sensitivity may not settle on its own, and further treatment (like a root canal) may be needed.

For most people, mild sensitivity should improve within a few days to a couple of weeks. However, if you’re still experiencing tooth sensitivity 6 weeks after a filling, it may be worth speaking to your dentist to rule out any issues.

Factors that affect healing time include:

• The size and depth of the cavity – larger fillings take longer to settle.
• The type of filling material used – composite fillings can sometimes cause more sensitivity than amalgam.
• Your bite alignment – if your filling is too high, you may need an adjustment
• Underlying nerve health – if the nerve is too inflamed, additional treatment may be needed.

If your tooth is sensitive after a filling, there are a few things you can do to manage the discomfort:

• Use a toothpaste for sensitive teeth – Sensodyne or Colgate Sensitive can help block nerve signals.
• Avoid very hot or cold foods – Temperature changes can trigger pain in sensitive teeth.
• Chew on the opposite side – Give the filled tooth a break while it settles.
• Avoid hard, sticky, or crunchy foods – These can put extra pressure on the filling.
• Use a soft-bristled toothbrush – Brushing too hard can make sensitivity worse.
• Take over-the-counter pain relief – Ibuprofen or paracetamol can help with discomfort.

If your sensitivity lasts longer than expected or worsens, contact your dentist in Leamington Spa for advice.

While some sensitivity is normal, persistent or severe pain could be a sign that something isn’t quite right. Contact your dentist if:

• Your tooth sensitivity after a filling lasts longer than 6 weeks.
• You experience sharp pain when biting down.
• The sensitivity gets worse instead of better.
• You have swelling or discomfort around the gum.

Your dentist may need to adjust your filling, check for nerve damage, or consider further treatment if the sensitivity does not improve. If you’re experiencing discomfort, don’t wait—book an appointment today.

A sensitive tooth after a filling is usually nothing to worry about and should improve with time. However, if your discomfort persists, it’s always best to get it checked. At Avenue Dental Practice, our experienced team is here to help you stay pain-free and confident in your dental health.

Need expert advice? Book a check-up today and let us help you enjoy a healthy, happy smile.