preventive care
Why Does My Tooth Hurt? 7 Common Causes of Tooth Pain and What You Can Do
Your Etobicoke dentists at Sherway Dentistry explain the most frequent reasons behind tooth pain and when you should seek professional care.
Why Does My Tooth Hurt? 7 Common Causes of Tooth Pain and What You Can Do
posted by Sherway Dentistry
A sudden, sharp jolt of pain when you bite into your morning toast. A dull ache that keeps you up at night. Sensitivity that makes every sip of cold water feel like a shock. Whatever form it takes, tooth pain is your body’s way of telling you something needs attention.
The tricky part? Toothaches have many possible causes, and the pain itself doesn’t always pinpoint the problem. What feels like a simple sensitivity issue could be an early sign of decay, while a barely noticeable discomfort might actually indicate advanced gum disease. That’s exactly why understanding the common causes of tooth pain matters so much for protecting your oral health.
As a family dentistry practice with over 40 years of experience serving Etobicoke and Mississauga, our team at Sherway Dentistry has treated thousands of patients who’ve asked the same question: “Why does my tooth hurt?” Below, we’ll walk you through the seven most common answers.
1. Tooth Decay and Cavities
Cavities are by far the most common reason people experience tooth pain. They develop when bacteria in your mouth produce acids that eat through your tooth’s protective enamel layer, creating small holes that gradually deepen over time.
Here’s what many patients find surprising: cavities don’t always hurt right away. In the earliest stages, decay can progress silently for weeks or even months. Pain typically starts when the cavity reaches the dentin layer beneath your enamel, which contains tiny nerve-connected tubes that transmit sensation. By the time you feel a sharp sting while eating something sweet or biting down, the decay may already be fairly advanced.
Common signs of a cavity include:
- Sharp or throbbing pain when eating sweet, hot, or cold foods
- Visible dark spots or holes on the tooth surface
- Pain when biting down or applying pressure
- Spontaneous toothache that comes and goes
Small cavities are usually treated with simple fillings. When decay becomes more extensive, your dentist may recommend a dental crown to restore the tooth’s shape and strength. The earlier you catch it, the simpler the treatment tends to be.
Prevention tip: Regular preventive care and hygiene appointments every six months allow your dentist to spot early decay before it causes pain. At Sherway Dentistry, our digital diagnostic tools help us detect cavities that aren’t yet visible to the naked eye.
2. Gum Disease (Gingivitis and Periodontitis)
Many people associate toothaches with problems in the tooth itself, but your gums play an equally important role. Gum disease, which begins as gingivitis and can progress to periodontitis, is a leading cause of tooth pain and tooth loss in adults.
It starts with bacterial plaque buildup along and below the gumline. In the early stage (gingivitis), gums become red, swollen, and bleed easily when you brush or floss. At this point, there’s usually no pain at all. But if left untreated, the infection advances deeper into the tissues that support your teeth, causing pockets of bacteria, bone loss, and eventually loose teeth.
Watch for these warning signs of gum disease:
- Red, puffy, or bleeding gums (especially when flossing)
- Persistent bad breath or a bad taste in your mouth
- Gums that appear to pull away from your teeth
- Teeth that feel loose or shift position
- Pain when chewing or sensitivity at the gumline
Treatment depends on the stage. Gingivitis often responds well to professional cleaning combined with improved home care. More advanced periodontal care may involve scaling and root planing (a deep cleaning below the gumline), antibiotic therapy, or referral to a periodontist. At Sherway Dentistry, we have a periodontist on staff to provide specialized treatment without sending you elsewhere.
3. Cracked, Chipped, or Fractured Teeth
A crack in your tooth can be one of the most frustrating sources of pain because it’s not always easy to see. Cracked teeth sometimes don’t show up on X-rays, and the pain may only appear when you bite at a certain angle or when releasing your bite rather than when clamping down.
Teeth can crack for several reasons. Biting into hard objects like ice, popcorn kernels, or pen caps is a common culprit. Sports injuries, car accidents, and falls account for many cases too. Large, old fillings can weaken the remaining tooth structure over time, making it more vulnerable to fracture. Even sudden temperature changes in your mouth (eating something very hot followed by something ice cold) can contribute.
Depending on the severity, treatment options range from dental bonding for minor chips to crowns and bridges for more significant fractures. In cases where the crack extends into the root, extraction followed by a dental implant may be the best path to restoring your smile and bite function.
Good to know: If you play contact sports or high-impact activities, a custom-fitted mouthguard from your dentist offers far better protection than over-the-counter options. Ask our team about sports mouthguards at your next appointment.
4. Teeth Grinding and Jaw Clenching (Bruxism)
Do you wake up with a sore jaw or dull headache? Do your teeth feel sensitive even though your dentist can’t find any cavities? You may be grinding your teeth at night without realizing it.
Bruxism, the clinical term for habitual teeth grinding or jaw clenching, affects an estimated one in three adults. It places enormous pressure on your teeth, often exceeding the force of normal chewing by several times. Over time, this can lead to:
- Worn-down, flattened, or chipped tooth surfaces
- Generalized tooth sensitivity and aching
- Jaw pain, headaches, and earaches
- Cracked teeth or damaged dental restorations
- Loosening of teeth in severe cases
Stress is the most common trigger, though misaligned teeth and sleep disorders can contribute. Treatment typically involves wearing a custom nightguard to protect your teeth during sleep. If alignment is a contributing factor, orthodontic treatment with Invisalign can address the underlying bite issues. Sherway Dentistry holds Platinum Invisalign Provider status, and our in-house orthodontist can evaluate whether clear aligner therapy would benefit your situation.
5. Wisdom Teeth Problems
If you’re between the ages of 17 and 25 and experiencing pain at the very back of your mouth, your wisdom teeth are a likely suspect. These third molars are the last teeth to emerge, and for many people, there simply isn’t enough room in the jaw to accommodate them properly.
When wisdom teeth can’t fully break through the gum (a condition called impaction), they can cause significant discomfort. The pain might feel like a deep, persistent ache in the back of the jaw. Impacted wisdom teeth can also push against neighboring teeth, causing crowding, damage to adjacent roots, and increased infection risk.
Signs your wisdom teeth may need attention:
- Swelling and tenderness at the back of the jaw
- Difficulty opening your mouth fully
- Pain that radiates toward your ear or temple
- Red, inflamed gum tissue around a partially erupted tooth
- Bad breath caused by bacteria trapped around the impacted tooth
Not all wisdom teeth need to be removed, but your dentist will monitor them carefully. When extraction is recommended, earlier treatment tends to mean an easier recovery. Learn more about our approach to wisdom teeth treatment and what recovery looks like.
6. Abscessed Tooth (Dental Infection)
An abscessed tooth is one of the more serious causes of tooth pain, and it requires prompt professional attention. An abscess forms when bacteria invade the dental pulp (the soft tissue inside your tooth containing nerves and blood vessels), creating a pocket of pus either at the tip of the root or in the gum tissue.
The pain from a dental abscess tends to be intense, throbbing, and persistent. It may radiate to your jawbone, ear, or neck. Some patients describe it as the worst toothache they’ve ever experienced. Beyond the pain, abscesses can cause:
- Swelling in the face, cheek, or neck
- Fever and a general feeling of being unwell
- A foul taste from draining pus
- Sensitivity to pressure and temperature
- Swollen lymph nodes under the jaw
Treatment depends on the extent of the infection. Root canal therapy can often save the tooth by removing infected tissue and sealing the canal. When the infection is too severe, extraction followed by a replacement option such as a dental implant, bridge, or denture may be necessary.
7. Tooth Sensitivity and Other Causes of Tooth Pain
Sometimes tooth pain doesn’t have a dramatic cause. Generalized sensitivity, where teeth react to hot, cold, sweet, or acidic foods, is extremely common and can result from:
- Enamel erosion from acidic foods, beverages, or acid reflux
- Aggressive brushing that wears down enamel or causes gum recession
- Recent dental work (temporary sensitivity after fillings, crowns, or whitening is normal)
- Exposed tooth roots from receding gums
It’s also worth knowing that not all mouth pain originates from your teeth. Sinus infections, for example, can produce pain that mimics a toothache in your upper back teeth because the sinus floor sits directly above those tooth roots. Vitamin deficiencies, TMJ disorders, and even cluster headaches can all present as tooth pain.
If you’re experiencing sensitivity that lasts more than a few days, your dentist can help identify the root cause. Sometimes the solution is as straightforward as switching to a desensitizing toothpaste or adjusting your brushing technique. Other times, treatments like fluoride varnish, cosmetic dentistry options such as veneers, or gum grafting may be recommended to address the underlying issue.
What Helps Tooth Pain at Home (Until You Can See Your Dentist)
While home remedies can’t fix the underlying problem, they can help manage discomfort until you get to our office. Here’s what our dentists recommend:
Over-the-counter pain relief: Ibuprofen (Advil) is often most effective for dental pain because it reduces both pain and inflammation. Follow the dosage instructions on the package.
Saltwater rinse: Dissolve half a teaspoon of salt in a glass of warm water and swish gently for 30 seconds. This helps reduce bacteria and soothe irritated gum tissue.
Cold compress: Hold an ice pack (wrapped in a cloth) against your cheek for 15 minutes on, 15 minutes off. This is especially helpful for swelling.
Clove oil: A small amount applied to the affected area with a cotton ball can provide temporary numbing. Clove oil contains eugenol, a natural anesthetic.
Avoid trigger foods: Stay away from very hot, very cold, sweet, or acidic foods and beverages until you’ve been evaluated.
Elevate your head: If the pain worsens at night, try sleeping with an extra pillow. Keeping your head elevated reduces blood flow to the area and can ease throbbing.
Important: These measures are temporary. Tooth pain that persists beyond a day or two, gets progressively worse, or is accompanied by swelling or fever always warrants a professional evaluation. Pain is your body’s signal that something needs repair, and delaying treatment almost always makes the problem more complex and costly.
When Tooth Pain Becomes a Dental Emergency
Most toothaches can be addressed at a scheduled appointment, but certain situations call for immediate care. You should contact an emergency dentist right away if you experience:
- Severe, uncontrollable pain that doesn’t respond to over-the-counter medication
- Visible swelling in your face, jaw, or neck
- A tooth that’s been knocked out or displaced by trauma
- A broken tooth with sharp edges cutting your tongue or cheek
- Fever accompanying tooth or gum pain
- Difficulty breathing or swallowing
- Difficulty Bleeding from the mouth that won’t stop after 10 minutes of firm pressure or swallowing
At Sherway Dentistry, we offer extended hours (weekdays 9 AM to 9 PM and Saturdays 9 AM to 4 PM) because we understand that dental emergencies don’t follow a convenient schedule. Our team prioritizes pain relief first, then works with you to determine the right treatment plan moving forward.
For children’s dental emergencies, our staff is trained in gentle, kid-friendly care to keep your little one calm and comfortable throughout treatment.
Protecting Your Smile: Why Preventive Care Is Your Best Defense
The best way to avoid tooth pain is to prevent the problems that cause it. That sounds obvious, but it’s easy to put off dental visits when nothing hurts. The reality is that many of the conditions discussed above, from cavities to gum disease to cracks, develop gradually and can often be caught and treated before they ever produce symptoms.
A comprehensive preventive care routine includes:
- Brushing twice daily with fluoride toothpaste (two minutes each time)
- Flossing at least once per day to remove plaque between teeth
- Professional dental cleanings and exams every six months
- Oral cancer screening as part of your routine checkup (at Sherway Dentistry, we use VELscope technology for early detection)
- Limiting sugary and acidic foods that contribute to enamel erosion
- Wearing a mouthguard during sports or if you grind your teeth
For patients interested in enhancing their smile while maintaining excellent oral health, we also offer professional teeth whitening with Philips Zoom technology. It’s a safe, effective way to brighten your smile under clinical supervision, avoiding the uneven results and sensitivity that sometimes come with over-the-counter whitening kits.
Frequently Asked Questions About Tooth Pain
How often should I visit the dentist for checkups?
Most people benefit from visiting the dentist every six months for a checkup and professional cleaning. This schedule allows your dentist to catch issues like early decay, gum disease, and enamel erosion before they become painful or expensive to treat. However, if you have a history of gum disease, frequent cavities, or certain health conditions like diabetes, your dentist may recommend visits every three to four months. At Sherway Dentistry, we create a personalized preventive care schedule based on your unique needs.
What should I do if I have a dental emergency at night or on the weekend?
If a dental emergency strikes outside regular hours, start by managing your symptoms: take ibuprofen for pain, apply a cold compress for swelling, and rinse with warm saltwater. If a tooth has been knocked out, keep it moist by placing it in milk or tucking it between your cheek and gum. Avoid aspirin directly on your gums, as it can cause tissue burns. Then call Sherway Dentistry at 416.621.4544 as soon as possible. We offer extended weekday hours until 9 PM and Saturday appointments to accommodate dental emergencies promptly.
Can a toothache go away on its own without treatment?
Mild, temporary sensitivity (for example, after a dental filling or professional cleaning) can resolve within a few days. However, a persistent toothache almost never goes away on its own because it signals an underlying problem like decay, infection, or structural damage that needs professional treatment. In fact, if a severe toothache suddenly stops hurting, that’s sometimes a sign the nerve has died, which doesn’t mean the problem is gone. The infection is likely still present and can spread. Always have a lingering toothache evaluated by your dentist rather than waiting for it to pass.
What are the signs that I might need a dental implant?
You might be a candidate for a dental implant if you have a missing tooth, a tooth that’s too damaged or decayed to save, or a tooth that has been lost due to advanced gum disease or trauma. Other signs include difficulty chewing in a specific area, visible gaps affecting your smile or speech, bone loss in the jaw from a previous extraction, or surrounding teeth that are starting to shift into the empty space. Dental implants function and look like natural teeth and help preserve your jawbone. Our team can evaluate whether implants are the right choice during a consultation.
Have Questions?
We hope you found this helpful! If you have any questions about your oral health or are interested in booking a future treatment, don’t hesitate to reach out to our friendly team at Sherway Dentistry. We’re always here to help you maintain a healthy, confident smile.
Emergency Services
Dental emergencies can’t wait — and neither should you. Whether it’s a broken tooth, sudden pain, or a lost filling, our team is ready to provide fast, compassionate care. Call us and get relief quickly so you can keep smiling confidently.
Sherway Dentistry Services
From routine cleanings to advanced restorative care, we’re here to meet your needs at every stage of life.
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