Patient question
My root canal still hurts 3 days later — is that normal?
Quick answer
Yes, mild to moderate soreness 3 days after a root canal is normal — it should be steadily trending down and well-controlled by ibuprofen. What is not normal: pain that is getting worse instead of better, swelling of the gum or face, fever, or pain that wakes you at night. Those warrant a call to the endodontist the same day. Most lingering bite tenderness comes from a slightly high filling, which is a 60-second adjustment.
Medically reviewed by Dr. Jason Kung, DDS, MS · Specialist Endodontist · UCLA DDS · OHSU MS ·
What "normal" recovery actually looks like
After a root canal, the tissue around the tip of the tooth (the periodontal ligament) is inflamed from the procedure itself. That inflammation peaks at about 24–48 hours and then resolves over the next 3–7 days. So on day 3, mild dull soreness or biting tenderness is expected. By the end of day 7, most patients report no symptoms at all.
Ibuprofen 400–600 mg every 6 hours, taken with food, is the gold standard for post-endodontic pain (Aminoshariae et al., JADA 2016). Alternate or combine with acetaminophen 500 mg if needed. Ice externally for 10 minutes on / 10 minutes off during the first 24 hours.
Call the office if you have any of these
- Pain that's getting worse instead of better after day 3.
- Visible swelling of the gum, cheek, or face.
- Fever over 100.4°F.
- Bad taste or discharge from the treated area.
- Severe pain that wakes you at night or that the ibuprofen isn't touching.
- Bite pain that doesn't improve within a week, even after a bite adjustment.
None of these mean disaster — most are easily managed — but they're the cluster of symptoms an endodontist needs to know about same-day. We answer the phone weekends.
The most common cause: a slightly high filling
If your only symptom is "it hurts when I bite," the cause is almost always that the temporary or permanent filling is a hair too tall — your treated tooth is hitting first when you close, transmitting all the force of your bite onto an already-inflamed ligament. A 60-second bite adjustment with articulating paper fixes it. This is the single most common post-root-canal call we get, and it's almost always a same-day fix.
Less common: residual infection or a missed canal
If pain genuinely persists beyond two weeks, or if it returns weeks after seeming fine, the next step is a clinical exam and usually a CBCT scan to look for an untreated canal (most commonly the MB2 in an upper first molar, which is present in roughly 90% of patients and is the leading anatomical cause of late root canal failure). If a missed canal is found, retreatment is straightforward and has a high success rate.
What to do tonight
- Take ibuprofen 600 mg with food (if you can take NSAIDs).
- Ice the outside of your cheek 10 minutes on, 10 off.
- Sleep with your head slightly elevated.
- Avoid chewing on the treated side.
- If pain is getting worse, or you see swelling or fever — call us: (669) 234-2354. We answer evenings and weekends.
Related questions
How many days of pain after a root canal is normal?
Mild to moderate soreness for 2–5 days is normal and is well-controlled by ibuprofen 400–600 mg every 6 hours (or acetaminophen if NSAIDs aren't an option for you). The pain should be trending down each day — not staying the same or getting worse.
What are the red flags I should call about?
Call the endodontist if you have: pain that is getting worse instead of better after day 3, visible swelling of the gum or face, fever, a bad taste/discharge from the area, severe pain that wakes you at night, or pain on biting that doesn't improve with a high bite adjustment. These suggest residual infection, a high bite, or — rarely — a missed canal.
Could my pain mean a canal was missed?
It's possible but uncommon when the treatment is done by a specialist endodontist under a microscope. The most common missed canal is the MB2 in upper first molars (present in ~90% of patients). If pain persists beyond two weeks and a CBCT scan shows an untreated canal, retreatment is straightforward.
Why does it hurt when I bite down?
Almost always because the temporary or permanent filling is slightly high — your tooth is hitting first when you close. A 60-second bite adjustment fixes it. If biting pain persists after a bite adjustment, the tooth's periodontal ligament may still be inflamed (give it 7–10 days) or there may be a hairline crack worth investigating.
Do I need antibiotics if my root canal still hurts?
Usually no. Pain alone is not an indication for antibiotics — current AAE guidance reserves antibiotics for systemic involvement (fever, swelling spreading, lymph-node involvement). If you have swelling or fever, call the office; if it's just pain, ibuprofen + ice + time is the right call.
Still have questions? Talk to a specialist.
Dr. Kung is happy to answer your question by phone before you book — no pressure, no charge for the conversation.