Root Canal
Why does my tooth feel sensitive to pressure weeks after a root canal?
18 October 2026 · The Dentist, Al Qusais, Dubai
The short answer
Mild sensitivity to biting pressure can linger for several weeks after root canal treatment while the ligament around the root settles down, and that's normal, especially in molars that take heavy chewing force. If the discomfort is getting worse, lasting beyond four to six weeks, or comes with swelling or a dull ache that wakes you at night, something usually needs attention, such as a high bite, a missed canal, a crack, or a tooth that still needs its permanent crown. An exam with an x-ray is the only reliable way to know which it is.
A little tenderness after root canal is usually part of healing
The nerve inside the tooth is gone after root canal treatment, but the tooth itself is still held in the jawbone by a thin ligament, the periodontal ligament, and that ligament gets irritated during the procedure. It can stay mildly inflamed for two to six weeks, longer in molars because they absorb far more force when you chew.
That kind of sensitivity usually shows up only when you bite down on something firm, like a nut or a crusty bit of bread, not as a spontaneous ache or a throb that appears out of nowhere. It tends to improve gradually week by week rather than staying flat or getting worse. If that matches what you're feeling, it's often just the ligament settling back down.
What's actually going on when it doesn't settle
A few things commonly explain sensitivity that persists or worsens. The most frequent is a high filling or crown, where the restoration sits a fraction of a millimetre too tall and takes the full force of your bite before the other teeth do. This is a quick fix once it's spotted, usually a few minutes of adjustment with a bite probe and articulating paper.
A missed canal or a pocket of infection the first treatment didn't fully clear can also cause lingering pressure pain, especially in molars, which often have three or four canals and the occasional extra one that's easy to overlook. A crack running through the tooth structure is another possibility, particularly if the tooth was heavily filled before the root canal, and it can cause pain specifically on release of biting pressure rather than during it.
If the root canal is on an upper back tooth, proximity to the sinus can also play a part, since inflammation there can feel like tooth pressure. And if the tooth is still sitting under a temporary filling rather than a permanent crown, that temporary material can flex slightly under chewing load and transmit more pressure to the root than a properly sealed crown would.
When to book a check and what happens at that visit
See a dentist if the sensitivity is increasing rather than easing after about two weeks, if it's still noticeable past four to six weeks, or if you notice swelling, a tender bump on the gum, a bad taste, or pain that wakes you at night. Those signs point to something that needs active treatment rather than time.
The check itself is straightforward: a bite test to find high spots, gentle tapping to see if the tooth reacts to percussion, and an x-ray to confirm the root canal has healed properly and there's no shadow of infection at the tip of the root. Depending on what's found, treatment might be as simple as adjusting the bite, or it might mean placing the permanent crown sooner, or in rarer cases retreating the canal.
If this sounds like your situation, it's worth having it looked at rather than waiting it out. At The Dentist in Al Qusais, Dr. Faris Alkhanafseh and Dr. Mohammad Nour can take an x-ray, check the bite, and tell you plainly whether it's normal healing or something that needs fixing. You can book through WhatsApp or online at thedentist.ae/book, and the first consultation for new patients is free.
This article is general information, not a diagnosis. If you are in Dubai, the free first checkup at our Al Qusais clinic is the fastest way to get an answer about your own teeth.