Why Does My Tooth Hurt? 7 Common Causes of Toothache

Toothache has a habit of appearing at the worst possible time – during dinner, late at night, or just before the weekend. Whether it’s a dull ache, sharp twinge or constant throbbing pain, it’s usually your body’s way of telling you something isn’t right.

The reassuring part is that most toothaches have a clear cause and can be treated quickly when caught early.

At Dental Care Ireland, we care for patients with dental pain every single day. With practices nationwide, you’re never far from your local practice. Our experienced teams are here to diagnose the issue, relieve discomfort and get you back to feeling yourself again.

Here are seven of the most common reasons your tooth might be hurting and what to do next.

1. Tooth Decay (Cavities)

This is the most common cause of toothache.

When plaque and bacteria build up on the teeth, they gradually wear down the enamel and create small holes. If decay reaches the inner part of the tooth where the nerve sits, pain can develop quickly.

You might notice:

• Sensitivity to cold, hot or sweet foods
  
• Pain when chewing
  
• A visible dark spot or hole
  

Treatment: A simple filling is often all that’s needed if treated early.

2. Dental Infection or Abscess

An infection inside the tooth or gum can cause intense, persistent pain and should be treated as soon as possible.

This type of pain usually doesn’t settle on its own and can worsen quickly.

You might notice:

• Severe throbbing pain
  
• Swelling in the gum, face or jaw
  
• A bad taste in your mouth
  
• Feeling generally unwell
  

Treatment: Root canal treatment or, in some cases, removal of the tooth.

If you suspect an infection, contact your local Dental Care Ireland practice straight away, as this can become a dental emergency.

3. Cracked or Broken Tooth

Even a small crack can expose the sensitive inner layer of the tooth and cause discomfort. Sometimes the damage isn’t visible but still causes sharp pain when biting.

You might notice:

• Pain when chewing or releasing your bite
  
• Sudden sensitivity
  
• Pain that comes and goes
  

Treatment: Bonding, a crown, or occasionally root canal treatment, depending on the severity.

4. Gum Disease

Not every toothache comes from the tooth itself. Inflamed or infected gums can cause soreness and tenderness around several teeth.

Gum disease is very common but highly treatable when caught early.

You might notice:

• Bleeding when brushing or flossing
  
• Swollen or red gums
  
• Bad breath
  
• Tenderness around the teeth
  

Treatment: Professional cleaning and personalised gum care advice from your dentist or hygienist.

5. Teeth Grinding (Bruxism)

Clenching or grinding your teeth, often during sleep, puts extra pressure on both your teeth and jaw. Over time, this can lead to aching teeth, headaches and worn enamel.

Stress is a frequent trigger.

You might notice:

• Jaw soreness in the morning
  
• Headaches
  
• Flattened or worn teeth
  
• General sensitivity
  

Treatment: A custom-made night guard can protect your teeth and relieve pressure.

6. Wisdom Teeth Problems

Wisdom teeth don’t always have enough room to come through properly. When they become trapped or partially erupted, food and bacteria can collect around the area and cause pain or infection.

You might notice:

• Pain at the back of your mouth
  
• Swollen or tender gums
  
• Difficulty opening your mouth fully
  

Treatment: Cleaning, antibiotics, or removal if needed.

7. Tooth Sensitivity or Enamel Wear

If your teeth hurt when you drink something cold or eat something sweet, enamel wear or exposed roots could be the cause.

This often feels like a quick, sharp pain rather than a constant ache.

You might notice:

• Sensitivity to hot, cold or sugary foods
  
• Discomfort that disappears quickly
  
• No visible damage
  

Treatment: Desensitising toothpaste, fluoride treatments or protective restorations can help.

Don’t Ignore Tooth Pain

Toothache rarely resolves by itself. Waiting often means the problem becomes more complex, and more costly to fix later.

Getting checked early usually means simpler, quicker treatment and faster relief.

At Dental Care Ireland, we’re proud to be your local practice with practices nationwide, so expert care is always close to home. Whether it’s a small issue or something more urgent, our teams are here to help you feel comfortable and confident again.

Find your local Dental Care Ireland practice here and book an appointment today.

If you’re in pain, don’t wait. We’re here when you need us.