Toothaches can be annoying, frustrating, and sometimes downright painful, and figuring out why your teeth ache isn’t always straightforward.
Is it something you ate? Is there a cavity brewing? Could it even be stress? The truth is, there are heaps of possible reasons why your teeth might be hurting, and not all of them are to do with poor dental hygiene.
Let’s break down the most common causes of tooth pain, from the obvious to the surprising, and when it’s time to call your dentist.
10 Possible Causes of Toothache
1. Tooth Decay (Cavities)
One of the most common causes of a toothache is the tooth cavity or dental caries. When plaque builds up on your teeth, it produces acid that wears away enamel. If a cavity forms, it can expose the sensitive layers underneath and lead to pain, especially when eating sweet, hot, or cold foods.
What it feels like: Dull or sharp pain, especially when biting or eating certain foods.
What to do: Book in for a check-up. Cavities can usually be fixed easily with a filling if caught early.
2. Gum Disease
Bleeding gums, bad breath, and aching teeth can all be signs of gum abscess or gum disease (gingivitis or periodontitis). Inflammation in the gums can cause soreness that feels like tooth pain, even if the teeth themselves are fine.
What it feels like: Achy or tender teeth and gums, especially when brushing.
What to do: Keep up your brushing and flossing, and see your dentist for a cleaning. Advanced gum disease needs professional treatment.
3. Tooth Grinding (Bruxism)
Do you wake up with sore teeth or a tight jaw? You might be grinding or clenching your teeth in your sleep. This habit can wear down enamel, strain your jaw, and lead to constant aching in your teeth and facial muscles.
What it feels like: A dull ache across multiple teeth, headaches, or sore jaw in the morning.
What to do: Your dentist may recommend a night guard or other strategies to reduce grinding.
4. Tooth Abscess or Infection
A serious cause of a toothache is an abscess, a pocket of pus caused by a bacterial infection. This kind of pain tends to be more intense and persistent. You may also notice swelling, a bad taste in your mouth, or even a fever.
What it feels like: Sharp, throbbing pain that doesn’t go away, plus possible swelling or fever.
What to do: See your dentist ASAP. Abscesses need urgent treatment and can lead to complications if ignored.
5. Cracked or Chipped Tooth
Sometimes a tooth cracks from biting something hard, clenching your jaw, or even just over time. If the crack gets into the inner layers of the tooth, it can expose the nerve and cause sharp pain.
What it feels like: Sharp pain when biting down or sudden sensitivity.
What to do: A dentist can repair the crack with bonding, a crown, or other restorative treatment, depending on the severity.
6. Impacted Wisdom Teeth
If your wisdom teeth haven’t fully come through or are stuck (impacted), they can cause pain in the back of the mouth, jaw, or even nearby teeth.
What it feels like: Pressure or pain at the back of your jaw, especially when chewing or opening wide.
What to do: Wisdom teeth might need removal. Your dentist will take an X-ray to check what’s going on.
7. Sinus Pressure or Infection
Believe it or not, sinus infections can cause your upper teeth to ache. That’s because your sinuses sit just above the roots of your upper back teeth — and when they get inflamed, it can feel like tooth pain.
What it feels like: A dull ache in upper teeth on both sides, often with sinus pressure, headache, or congestion.
What to do: If the pain goes away as your sinus clears up, it’s likely not a dental issue. But if in doubt, see your GP or dentist.
8. Overbrushing or Using a Hard Toothbrush
Brushing too hard or using a firm-bristled toothbrush can wear down your enamel and make your teeth more sensitive. It can also cause gum recession, exposing the roots of your teeth, which are much more sensitive to temperature.
What it feels like: Sudden sensitivity to hot or cold, or discomfort after brushing.
What to do: Switch to a soft-bristled toothbrush and use gentle, circular motions. Ask your dentist about sensitivity toothpaste if needed.
9. Recent Dental Work
Had a filling, crown, or cleaning recently? Some discomfort is normal for a few days afterwards your teeth might be adjusting to the new material or position.
What it feels like: Mild ache or sensitivity that fades after a few days.
What to do: Give it time. If the pain gets worse or lasts longer than a week, check back with your dentist.
10. Referred Pain or Nerve Issues
Sometimes tooth pain isn’t about the tooth at all. Jaw problems (like TMJ disorders), nerve pain, or even heart issues (in very rare cases) can cause pain that feels like a toothache.
What it feels like: Varies widely, pain might move around, feel vague, or come with other symptoms like jaw clicking or ear pain.
What to do: If your dentist rules out dental issues, they might refer you to your GP or a specialist.
When to See a Dentist
If you’ve got a toothache that lasts more than a day or two, don’t try to tough it out. Pain is your body’s way of saying something’s not right. Even if it goes away on its own, the underlying issue could still be there.
You should definitely book in if:
- The pain is getting worse
- You have swelling or a fever
- You’ve got pain when chewing or biting
- You notice a bad taste or smell
- It’s been a while since your last dental visit
Final Thoughts
Toothaches can be caused by all sorts of things, from cavities to clenching, to sinuses and stress. While some causes are harmless or temporary, others need urgent care.
The bottom line? If something feels off with your teeth, don’t ignore it. Book in with your local dentist, get the toothache treatment, and save yourself from bigger problems down the track.
