Pain after root canal treatment is common, especially in the first 24–72 hours, and is usually a normal part of healing. It typically feels like mild to moderate tenderness when you bite or touch the tooth, and it eases over a few days. If the pain gets worse, lasts beyond a week, or comes with swelling or fever, contact your dentist.
A definitive diagnosis and treatment plan can only be made by a dentist after an examination.
Why does pain after root canal treatment happen?
During treatment, inflamed or dead pulp tissue is removed and the canals are shaped, disinfected and sealed. This can briefly irritate the tissues just beyond the root tip. The ligament that holds the tooth in the bone also becomes sensitive, so the tooth may feel "high" or sore to bite on.
If the tooth was very painful or infected before treatment, sensitivity afterwards may be a little more noticeable. Your jaw muscles may also ache from keeping your mouth open.
How long does it last?
A 2011 systematic review by Pak and White reported that pain is highest on the first day and drops substantially over the following days, reaching low levels for most patients within about a week. Everyone heals differently, so treat these timings as a rough guide.
Managing it at home
- Take the pain relief your dentist recommends, at the advised dose. Do not start antibiotics on your own.
- Avoid chewing hard or sticky food on that side for a few days.
- If you have a temporary filling, chew on the other side and call us if it comes out.
- Keep brushing and flossing gently.
- Mention night-time clenching, as it can prolong tenderness.
Sometimes a filling sits slightly high and hits the opposite tooth first. A quick adjustment at the clinic often helps.
When to call the dentist
- pain that increases rather than decreases;
- swelling of the face or gum;
- fever, a bad taste or discharge;
- pain lasting more than a week, or returning later;
- a cracked feeling or a lost restoration.
These may point to a missed canal, persistent infection or a root fracture, which can be investigated with an X-ray.
Protecting the tooth long term
A 2007 systematic review by Ng and colleagues reported high success rates for primary root canal treatment, with outcomes strongly linked to thorough cleaning and a well-sealed restoration. Back teeth often need a crown afterwards; your dentist may suggest a zirconia crown. Learn more about root canal treatment or our endodontics and aesthetic dentistry team.
Frequently asked questions
Why does my tooth hurt when I bite after a root canal?
The tissues around the root tip are temporarily irritated by treatment. This makes the tooth tender under pressure. It usually improves within a few days.
Do I need antibiotics after a root canal?
Usually not. Antibiotics may be prescribed if there is swelling, fever or spreading infection. Your dentist will decide whether they are needed.
When can I eat after treatment?
Wait until the numbness has fully worn off so you do not bite your lip or cheek. Soft food on the other side is more comfortable for the first days.
What if pain returns months later?
Late pain can be caused by leakage, a root fracture or renewed infection at the root tip. An examination and X-ray will show the cause, and retreatment may be considered.
References
- Pak JG, White SN. Pain prevalence and severity before, during, and after root canal treatment: a systematic review. J Endod. 2011;37(4):429–438.
- Ng YL, Mann V, Rahbaran S, Lewsey J, Gulabivala K. Outcome of primary root canal treatment: systematic review of the literature – Part 1. Effects of study characteristics on probability of success. Int Endod J. 2007;40(12):921–939.
- Hargreaves KM, Berman LH (eds). Cohen's Pathways of the Pulp. 11th ed. St. Louis: Elsevier; 2016.
Contact us
If symptoms persist or you would like an assessment, our Bahçelievler clinic is a short walk from the M3 İlkyuva metro stop. You can message us in English on WhatsApp or use our contact page.
Medically reviewed by the dentists of Yayla Dental Akademi.