Toothache: Causes, Relief & When It's a Dental Emergency

We’ve all been there—that sudden and sharp zing while drinking iced lemon tea that just won’t go away. In every day’s fast-paced life, it’s easy to push dental pain to the back of your mind. But a toothache is your body’s way of saying something is wrong, and ignoring it usually leads to bigger problems later.

Why does a tooth hurt?

Your teeth are protected by hard enamel. When that protection is compromised by decay, cracks, or gum disease, the sensitive nerves inside the tooth become exposed. Common culprits include:

1. Tooth decay (cavities)

This is the most common cause worldwide.¹ Bacteria in the mouth feed on sugars and produce acid that slowly dissolves enamel. As decay deepens into dentine and then the pulp, pain increases from mild sensitivity to severe, constant aching.

2. Cracked or fractured tooth

A crack in a tooth can be invisible by eyes, only on an X-ray, It can cause sharp, stabbing pain — especially when biting down.

3. Dental abscesses

A painful bacterial infection at the root of a tooth or in the surrounding gum.² It causes severe, throbbing pain that is often constant, and may be accompanied by swelling, fever, and a bad taste in the mouth.

4. Gum disease

Advanced gum disease (periodontitis) causes the gum and bone supporting the tooth to break down, exposing the root surface. This leads to sensitivity and aching, particularly to cold and sweet foods.

5. Bruxism (teeth grinding)

Chronic teeth grinding wears down enamel and can inflame the pulp over time, causing diffuse tooth sensitivity and jaw soreness.³

What does the type of pain tell you?

Pain characteristics can help your dentist narrow down the cause before they even examine you:

•         Sharp pain when biting, but brief: Likely a cracked tooth or loose/damaged filling.

•         Sensitivity to cold that passes quickly: Usually dentine exposure or early decay — less urgent but needs attention.

•         Constant, throbbing ache: Classic sign of infection or abscess. Do not delay.

•         Pain only when pressing on the gum near the tooth: May indicate an abscess forming at the root tip.

•         Pain in multiple teeth or in the jaw: Could be bruxism, sinus pressure, or referred pain. A dentist can differentiate.

If any of the above sounds very familiar to you, please refer to your dentist for further investigations.

Not sure if your toothache needs urgent care, or can wait? Take our 2-minute self-check to find out.

Some home remedies and assist the temporary relief

They reduce pain while you wait to see a dentist — they are not a substitute for treatment.

•         Warm salt water rinse: Dissolve half a teaspoon of salt in a glass of warm water and rinse gently. Salt water reduces inflammation and kills some bacteria.

•         Over-the-counter pain relief: Ibuprofen (if suitable for you) reduces both pain and inflammation. Paracetamol (acetaminophen) also works well. Please follow doctors instructions.

•         Cold compress: Apply ice to your cheek to numb the area and reduce swelling.

•         Avoid triggers: If your tooth is sensitive to temperature or pressure, avoid the foods and actions that trigger it until you can see a dentist.

When is a toothache a dental emergency?

Most toothaches can wait for a next-day or same-week dental appointment. But some situations require same-day emergency care. Go to an emergency dentist or hospital if you have:

• Severe pain that is not controlled by normal doses of painkillers

• Swelling of the face, jaw, or neck — especially if it is spreading

• Fever above 38°C / 100.4°F alongside tooth or jaw pain

• Difficulty swallowing or breathing — this may indicate the infection has spread to the throat⁵ 

• A pimple-like swelling on the gum (dental abscess) that is growing or very painful

• A tooth that has been knocked out — re-implantation may be possible if you act within 30–60 minutes

Dental infections can spread rapidly to the jaw, neck, and — in rare cases — to the brain or chest cavity. These are life-threatening complications. Do not wait.

What will the dentist do?

Your dentist will take X-rays and examine the tooth to find the cause. Treatment depends on the diagnosis:

•         Cavity: Filling, or root canal if decay has reached the pulp.

•         Cracked tooth: Crown, root canal, or extraction depending on severity.

•         Abscess: Drainage of the infection, antibiotics, and root canal treatment or extraction.

•         Gum disease: Deep cleaning (scaling and root planing), and in some cases surgical intervention.

•         Damaged filling: Replacement filling or crown.

Prevention: how to avoid toothache

The best toothache is the one you never get:

•         Reduce sugary and acidic drinks: these accelerate enamel erosion

•         See a dentist for a check-up every 6–12 months and catch decay before it hurts

•         Do not use your teeth as tools (opening bottles, tearing packaging)

Frequently Asked Questions(FAQ)

Q: What causes a toothache?

A: The most common causes of toothache are tooth decay (cavities), cracked teeth, dental abscesses (infections), gum disease, exposed root surfaces, damaged fillings, and teeth grinding (bruxism).

Q: How do I relieve a toothache at home?

A: Rinse with warm salt water, take over-the-counter pain relief (ibuprofen or paracetamol at the recommended dose), apply a cold compress to the outside of your cheek, and avoid very hot, cold, or sweet foods. These measures provide temporary relief only — see a dentist as soon as possible.

Q: Can a toothache go away on its own?

A: Mild tooth sensitivity may come and go, but a genuine toothache rarely resolves without treatment. If pain disappears suddenly after being severe, it may mean the nerve has died — which still requires dental treatment. Ignoring toothache almost always makes the underlying problem worse and more expensive to treat.

Q: Why does my toothache hurt more at night?

A: Lying down increases blood pressure in the head, which amplifies throbbing pain in an inflamed tooth. There are also fewer distractions at night, making you more aware of the pain. If your tooth pain is significantly worse at night, it is a sign the pulp is inflamed or infected — see a dentist promptly.

Q: Should I take antibiotics for a toothache?

A: Antibiotics alone do not cure a toothache — they cannot remove infected tissue or repair a damaged tooth. They may be prescribed alongside dental treatment to control a spreading infection. Do not take leftover antibiotics for tooth pain without a dentist's assessment.

This article is produced by the Education Team of the Modern Dental Global Foundation. MDGF is a non-profit dental charity and education. This content is for informational purposes only and does not constitute individual medical or dental advice. Please consult a qualified dental professional for personal guidance.

References [1] World Health Organization (WHO). (2023). Oral health.

[2] Mayo Clinic. (2022). Tooth abscess - Symptoms and causes.

[3]American Dental Association (ADA). (n.d.). Teeth Grinding (Bruxism).

[4]American Dental Association (ADA). (n.d.). Home Remedies for Toothache. [5]National Health Service (NHS). (2022). Toothache.