Root canal treatment cleans infection from inside the tooth and its roots. It is normal to feel some soreness for a few days afterwards — this does not mean anything has gone wrong.
Tenderness around the tooth: The area around the tooth tip (the root end) may feel tender when you bite or press on it. This is called post-operative sensitivity and is experienced by about 1 in 3 people after treatment. It usually settles within 2–7 days.
Mild aching: A dull ache in the jaw is common on the day of treatment and the day after. Over-the-counter painkillers manage this well for most people.
Temporary filling or dressing: If your treatment is being completed over more than one appointment, your dentist will have placed a temporary filling. Avoid chewing on this side until your next appointment.
Anaesthetic numbness: This will wear off within 2–4 hours. Avoid hot food or drinks until sensation returns fully.
Managing Pain and Sensitivity
Some discomfort after root canal treatment is expected and is a sign that your body is healing — not a sign that the treatment has failed.
Take ibuprofen 400mg (up to three times daily with food) or paracetamol 1g (up to four times daily) to manage soreness. These can be alternated for better effect. Only take ibuprofen if it is safe for you (avoid if you take blood-thinning medications, have stomach problems, or are pregnant).
Start pain relief before the anaesthetic wears off rather than waiting for pain to build.
Avoid biting on the treated tooth for the first few days — chew on the other side where possible.
Sensitivity to biting usually improves within a week. If it is getting worse after 5–7 days, contact your dentist.
Looking After the Temporary Filling
If your root canal treatment is being done over more than one visit, you will have a temporary filling in place between appointments. This filling is deliberately soft — it is not as strong as a permanent one.
Avoid chewing hard or sticky foods on that side — this can dislodge or crack the temporary filling.
If the temporary filling feels very high or uncomfortable, contact your dentist so they can adjust it.
If the temporary filling comes out, contact your dentist promptly — the tooth needs to be protected to prevent recontamination of the root canal.
It is normal for the temporary filling to wear down slightly between appointments — a thin layer is usually still in place even if it feels different.
The Permanent Restoration — Why It Matters
Root canal treatment saves the tooth by removing infected tissue from inside it. However, the tooth still needs a strong permanent restoration to protect it long-term.
Teeth that have had root canal treatment can become more brittle over time. A crown is usually recommended to protect the tooth from fracture, especially for back teeth (molars and premolars).
Your dentist will discuss the best permanent restoration for your tooth at your next appointment.
Do not delay getting the permanent restoration — a tooth left with a temporary filling for too long is at risk of reinfection or fracture.
With a good permanent restoration and regular dental care, a root canal treated tooth can last many years — sometimes for life.
When to Contact Your Dentist
Contact your dentist if you notice any of the following:
Severe pain that is not controlled by over-the-counter painkillers
Pain or tenderness that is getting worse after 5–7 days rather than improving
Visible swelling inside your mouth (on the gum near the tooth) or outside on your face or jaw
A high temperature above 38°C
The temporary filling falls out completely
A return of the original symptoms (severe toothache, throbbing pain)
An allergic reaction to any prescribed medication (rash, itching, swelling)
Call NHS 111 if you cannot reach your dentist. Go to A&E if you have difficulty breathing or swallowing, or if swelling is spreading rapidly.
This leaflet is for general information only and does not replace professional dental advice. Your dentist will discuss your individual circumstances and any risks specific to you. Treatment outcomes vary between patients depending on individual circumstances.
When to Seek Urgent Help
Contact your dentist if you have severe pain not controlled by over-the-counter painkillers, significant swelling inside or outside your mouth, a high temperature above 38°C, or if a temporary filling falls out. Call NHS 111 if you cannot reach your dentist. Go to A&E if you have difficulty breathing or swallowing.
References
Aligned with guidance from: SDCEP, FGDP(UK), BES (British Endodontic Society).