A tooth that hurts when you bite down is most often caused by a cavity, a cracked tooth, a loose or high filling, gum inflammation, or an infection near the root. Occasional mild tenderness after dental work or a hard bite is common and usually temporary. Sharp, lingering or worsening pain, however, is a sign that something inside the tooth needs attention, and in some cases root canal treatment is what finally brings relief.
Biting pain is one of the most frequent complaints we hear at Columbus Dental Centre, a trusted family and cosmetic practice that has served Woodbridge and the wider Vaughan community for over 26 years. The good news is that most causes are very treatable when they are caught early.
Small problems like a worn or cracked filling can often be resolved quickly with modern fillings and restorations. When more of the tooth is damaged, a ceramic crown made with CEREC single-visit technology can protect it in one appointment instead of several.
If you are experiencing pain right now, you can request a time through our online booking page. Below, we explain the most common causes of pain when biting, how to tell which one you might have, and what treatment usually involves.
What Does Pain When Biting Mean?
Pain on biting, sometimes called occlusal sensitivity or percussion sensitivity, means that pressure on the tooth is triggering a response in the nerve inside the tooth or in the ligament that holds the tooth in its socket. The ligament, known as the periodontal ligament, acts like a shock absorber. When it becomes inflamed, even light pressure can feel sore.
The type of pain often gives clues about the cause:
- Sharp, brief pain when you bite or release: often a cracked tooth or loose filling
- Dull ache that builds with chewing: often a high filling, grinding or sinus pressure
- Throbbing pain that lingers after biting: often deep decay or nerve inflammation
- Tender, swollen feeling with a bad taste: often infection or an abscess
Common Causes of a Tooth That Hurts When You Bite
1. Tooth Decay
As a cavity grows through enamel into the softer dentin, the tooth becomes weaker and more sensitive. Chewing presses food into the decayed area and flexes the weakened tooth, which stimulates the nerve. Decay between teeth is especially easy to miss until it hurts.
2. Cracked Tooth Syndrome
A crack can be too small to see but still cause sharp pain, especially when you release a bite. Each time you chew, the two sides of the crack move slightly, irritating the pulp. Cracks are common in molars with large old fillings and in people who grind or clench.
3. A High or Loose Filling or Crown
If a new filling or crown sits even slightly too high, that tooth takes more force than its neighbours and becomes sore. An old filling that has loosened or developed a gap can also let bacteria and fluid move under it, causing pain on pressure.
4. Pulp Inflammation (Pulpitis)
Deep decay, repeated dental work or trauma can inflame the pulp. Early, reversible pulpitis may settle once the cause is removed. Irreversible pulpitis means the nerve cannot recover and usually needs root canal therapy.
5. Tooth Abscess or Infection
When infection spreads to the root tip, pressure builds in the bone. The tooth may feel raised or “longer” than the others, and biting can be very painful. Swelling, a gum bump, or a bad taste may follow.
6. Gum Disease
Advanced gum disease destroys the bone and ligament around teeth. Loose, inflamed teeth often hurt when chewing.
7. Teeth Grinding and Clenching
Bruxism overloads the ligaments around teeth. Several teeth may feel sore in the morning, often along with jaw tightness or headaches.
8. Sinus Pressure
The roots of upper back teeth sit close to the maxillary sinuses. During a sinus infection or allergy flare, these teeth can ache when you bite, even though they are healthy.
9. Recent Dental Work
Mild biting tenderness for a few days after a filling, crown or cleaning is normal. If it lasts longer than about two weeks or worsens, it should be checked.
Quick Guide: Matching Symptoms to Possible Causes
| Symptom | Likely Cause | Urgency |
|---|---|---|
| Sharp pain when releasing bite | Cracked tooth | Book soon |
| Sore after a new filling | High filling | Simple adjustment |
| Pain with cold and sweets plus biting | Cavity | Book soon |
| Throbbing, wakes you at night | Pulpitis or abscess | Same day |
| Swelling, fever, bad taste | Infection | Urgent |
| Several upper teeth ache with a cold | Sinus pressure | Monitor, see doctor |
| Morning soreness, jaw tightness | Grinding | Routine visit |
When Should You See a Dentist?
Book an appointment if biting pain lasts more than a few days, keeps coming back, or seems to be getting worse. Seek same-day care if you have:
- Swelling in the gums, cheek or jaw
- Fever or a general feeling of being unwell
- Pain that keeps you awake
- A visible break or a tooth that feels loose
- Pus or a bad taste coming from around a tooth
Go to a hospital emergency department if swelling affects breathing or swallowing.
How Dentists Find the Cause: Step by Step
- Conversation about symptoms: When it started, what triggers it, and whether you have had recent dental work.
- Visual exam with magnification: Checking for decay, cracks, worn fillings and gum problems.
- Bite test: A small instrument lets the dentist test individual cusps to locate a crack.
- Tapping and cold testing: Shows how the ligament and nerve are responding.
- Digital X-rays: Reveal hidden decay, bone loss and infection at root tips.
- Bite check: Articulating paper shows whether a filling or crown is hitting too hard.
Treatment Options for Pain When Biting
Bite Adjustment
If a filling or crown is too high, a quick polish to reshape it often brings relief within a day or two.
New Filling
Decay is removed and the tooth is restored with a tooth-coloured composite filling.
Crown
Cracked teeth and teeth with large fillings often need a crown to hold the tooth together and spread chewing forces. CEREC technology allows a ceramic crown to be designed, milled and placed in a single visit.
Root Canal Treatment
When the nerve is irreversibly inflamed or infected, root canal therapy removes the damaged pulp, disinfects the canals and seals the tooth, usually followed by a crown.
Gum Treatment
Deep cleaning and ongoing periodontal care stabilize teeth affected by gum disease.
Night Guard
For grinding-related soreness, a custom night guard protects teeth and relaxes overworked ligaments.
Extraction
If a tooth is split or cannot be restored, gentle extraction followed by an implant, bridge or denture may be recommended.
Traditional Crown vs CEREC Same-Day Crown
| Factor | Traditional Lab Crown | CEREC Same-Day Crown |
|---|---|---|
| Appointments | Usually two | One |
| Temporary crown | Required for one to three weeks | Not needed |
| Impressions | Often physical impression material | Digital 3D scan |
| Material | Various | High-strength ceramic |
| Best for | Complex or multi-unit cases | Many single-tooth restorations |
For many cracked or heavily filled teeth, CEREC same day crowns Woodbridge patients receive protect the tooth faster and remove the risk of a temporary crown loosening.
Home Relief While You Wait
- Chew on the opposite side of your mouth.
- Choose soft foods and avoid very hard, sticky or chewy items.
- Take over-the-counter pain relief as directed, if safe for you.
- Rinse with warm salt water if gums are tender.
- Avoid extremely hot or cold foods and drinks.
These steps can ease discomfort, but they do not fix the underlying problem.
Myths About Pain When Biting
Myth: If the pain comes and goes, it is nothing serious
Intermittent pain is classic for cracked teeth and early nerve inflammation. Both can get worse without treatment.
Myth: A tooth with a filling cannot get a cavity
Decay can form around and under old fillings, especially at the edges.
Myth: Root canals cause more pain
Root canal treatment relieves pain caused by inflamed or infected pulp. With modern anesthesia, the procedure feels similar to a filling.
Real Patient Scenarios
The cracked molar
A patient in his fifties felt a zing every time he released a bite on his lower left side. X-rays looked normal, but a bite test revealed a crack under an old filling. A CEREC crown placed the same day ended the pain.
The new filling that felt “too tall”
A teenager had a filling placed while numb and later found that tooth sore every time she chewed. A two-minute adjustment fixed the problem.
The sinus surprise
Another patient worried that several upper teeth needed work during a bad cold. The exam showed healthy teeth, and the discomfort eased once the sinus congestion cleared.
Common Mistakes to Avoid
- Waiting months for pain to “settle” while a crack spreads
- Relying on painkillers alone
- Chewing ice or hard candy on a sore tooth
- Skipping a recommended crown after a large filling
- Ignoring a filling that feels high after numbness wears off
Prevention Tips
- Brush twice daily with fluoride toothpaste and clean between teeth every day.
- Keep regular checkups so cracks and decay are caught early.
- Wear a night guard if you grind or clench.
- Avoid chewing ice, popcorn kernels and hard objects.
- Replace worn or leaking fillings before they fail.
Getting Help From a Dentist in Woodbridge
Columbus Dental Centre is a dental clinic in Woodbridge located at Suite #201, 8333 Weston Rd, Woodbridge, Ontario. For more than 26 years, families across Woodbridge and Vaughan have trusted our team for gentle, thorough care. We welcome new patients and accept CDCP (Canadian Dental Care Plan) patients.
Our full range of services includes smile design and aesthetic dentistry, removable dentures and fixed bridges, CEREC single-visit crowns and veneers, painless oral surgery, fillings and restorations, root canal treatment, dental implants, teeth whitening, preventive care, children dentistry and laser dentistry. As a family dentist in Woodbridge, we can care for every generation in one place.
We also offer extended hours for busy schedules, including Monday 10:00 AM to 8:00 PM and Saturday 9:00 AM to 4:00 PM. Call +1 647-931-1100 or email columbusdentalcentre@gmail.com, and our team will respond quickly to help you find a suitable appointment.
Diagnosis and treatment should always come from a licensed professional. Dentists in Ontario must be registered with the Royal College of Dental Surgeons of Ontario (RCDSO), which sets standards for safe, ethical and evidence-based care.
Disclaimer: This article is for general education and does not replace an in-person dental examination. If you have swelling, fever or difficulty swallowing, seek prompt professional care.
Frequently Asked Questions
Why does my tooth hurt when I bite but not otherwise?
Pain only on pressure often points to a crack, a high filling or inflammation of the ligament around the tooth. An exam and bite test can confirm the cause.
Can a cracked tooth heal by itself?
No. Teeth cannot repair cracks naturally. A crown or other restoration is usually needed to hold the tooth together and stop the crack from spreading.
How long is it normal for a tooth to hurt after a filling?
Mild tenderness for a few days, and occasionally up to two weeks, is normal. Pain that worsens or lasts longer should be checked.
Is pain when biting always a sign I need a root canal?
No. Many cases are solved with a bite adjustment, new filling or crown. Root canal treatment is needed only when the nerve is irreversibly inflamed or infected.
Can sinus problems really make teeth hurt?
Yes. Upper back teeth sit near the sinuses, so congestion can cause pressure that feels like a toothache when biting.
Conclusion
Pain when biting is usually caused by decay, a crack, a high filling, infection or grinding.
Mild tenderness after dental work often fades, but persistent or worsening pain needs an exam.
Early diagnosis keeps treatment simpler and helps protect your natural tooth.
