Pain when you bite down usually means something specific is going on, not just general sensitivity. The good news is that this type of pain gives your dentist a lot to work with. Where it hurts, when it hurts, and how it feels all point toward a likely cause. Here are the most common ones.
- Pain that spikes when you release the bite, rather than during chewing, often points to a cracked tooth, even a hairline crack too small to see.
- Pain paired with sensitivity to sweet foods often points to a deep cavity, while pain on a specific tooth with a filling or crown may mean it’s no longer sealed properly.
- Sharp, constant pain that worsens with pressure, especially with swelling or a bad taste, can signal an infection at the root and needs prompt attention.
- Tooth pain when biting can sometimes be caused by sinus pressure rather than a dental issue, particularly if it started alongside a cold or congestion.
- Mild sensitivity after recent dental work is normal for a week or two, but pain that worsens instead of easing is worth getting checked.
A cracked tooth
This is one of the most common causes of pain specifically when biting. Even a hairline crack, often too small to see, can flex slightly under pressure. That movement irritates the nerve inside the tooth.
A telltale sign of a cracked tooth is pain that spikes when you release the bite, not just while you’re chewing. It can also come and go, which makes it easy to dismiss. But cracks don’t heal on their own. Left untreated, they tend to deepen over time, and can eventually lead to infection or nerve damage.
Tooth decay or a cavity
A cavity that’s grown deep enough can cause pain under pressure, especially once it’s close to the nerve. Unlike a crack, decay-related pain is often paired with sensitivity to sweet foods as well, not just biting pressure.
A loose or failing filling or crown
If you have an existing filling or crown, pain on that specific tooth can mean it’s no longer sealed properly. Bacteria can work their way underneath, causing pain and, eventually, decay in the tooth beneath it. This is worth checking quickly, since it’s a straightforward fix while caught early.
An abscess or infection
If the pain is sharp, constant, and gets worse with pressure, and especially if there’s also swelling, a bad taste, or sensitivity to touch, this can point to an infection at the root of the tooth. This isn’t something to wait out. Infections can spread if left untreated, and early treatment is far simpler than what’s needed once it progresses.
Sinus pressure
This one surprises a lot of people. The roots of your upper back teeth sit close to your sinuses. A sinus infection or congestion can sometimes cause tooth pain that mimics a dental problem, especially when biting or chewing on that side. If the pain came on alongside a cold or sinus symptoms, this is worth considering.
Recent dental work
If you’ve had a filling, crown, or root canal recently, some sensitivity when biting is normal for a short period afterward as the area settles. This should ease within a week or two. If it’s getting worse instead of better, or lasting longer than that, it’s worth getting checked.
When to see a dentist
A single, brief twinge after biting into something hard usually isn’t urgent. But you should book an appointment soon if the pain is:
- Sharp and repeated, not just a one-off
- Getting worse over a few days rather than settling
- Paired with swelling, sensitivity to temperature, or a bad taste
- Localized to one specific tooth you can point to
None of the causes above get better by waiting. An early diagnosis usually means a simpler, cheaper fix, while delaying often means the opposite.
Procare Dental Surgery can identify exactly what’s causing it and get it treated before it becomes a bigger problem.
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Frequently Asked Questions
Why does my tooth only hurt when I bite down, not otherwise? This pattern often points to a cracked tooth, where even a hairline crack too small to see flexes under pressure and irritates the nerve. A telltale sign is pain that spikes specifically when you release the bite, not just while chewing.
Can sinus problems really cause tooth pain? Yes. The roots of your upper back teeth sit close to your sinuses, so a sinus infection or congestion can cause pain that mimics a dental problem, especially when biting or chewing on that side. If the pain started alongside a cold, this is worth considering.
Is it normal to have pain after a filling or crown? Some sensitivity when biting is normal for a short period after recent dental work, and should ease within a week or two. If it’s getting worse instead of better, or lasts longer than that, it’s worth getting checked.
When should I stop waiting and book a dentist for bite pain? Book an appointment if the pain is sharp and repeated, getting worse over a few days, paired with swelling or a bad taste, or localised to one specific tooth. None of the common causes improve by waiting, and early diagnosis usually means a simpler, cheaper fix.