What does this mean?
A root canal removes the inflamed nerve tissue inside the tooth, but the bone and gum around the tip of the root are still affected by the procedure. The work itself, and any pressure towards the root tip, can leave that surrounding tissue tender for a few days.
The usual pattern is mild pain on biting or touching the tooth, strongest in the first days and easing a little each day. In most people it settles clearly within a week, and it can sometimes linger for up to two weeks.
The direction of the pain is the guide. If it is easing, healing is on course. If it grows after the third or fourth day, the gum swells, or the pain wakes you at night, the canals may not be fully clean or the bite may be off, and the tooth needs to be checked again.
Four causes are common when the pain persists, and the way it arrives helps tell them apart.
Likely causes
What helps at home?
- Do not chew hard food on that tooth until the permanent filling or crown is in place
- If the temporary filling falls out or breaks, do not leave the tooth open; tell your dentist
- If you take a painkiller, use the one and the dose your dentist advised
- Do not keep pressing the tooth with your tongue or finger
- Swelling in the face, cheek or gum
- A fever or feeling generally unwell
- Pain that grows after the third day or does not respond to medication
- Difficulty swallowing or opening the mouth
Frequently asked questions
- How long does pain last after a root canal?
- A few days of mild tenderness is normal, and in most people it eases clearly within a week. If the pain grows instead of fading, see a dentist without waiting.
- Why does a root-treated tooth hurt when I bite?
- The tissue at the root tip may not have settled yet, or the filling or crown may be slightly high. A high point is corrected with a small adjustment, while inflammation needs a check.
- Does a root-treated tooth need a crown?
- A tooth that has had a root canal is usually more brittle, especially at the back. Dentists therefore often recommend a permanent crown or a strong filling; the decision depends on how much of the tooth is left.
This content is for general information and does not replace an in-person examination. Symptoms overlap between conditions, and a diagnosis can only be made clinically.