An inflamed tooth nerve, called pulpitis, happens when decay, a crack or a deep filling irritates the soft tissue inside the tooth. In mild, reversible pulpitis the pain is brief and the nerve can recover once the cause is treated. In irreversible pulpitis the pain lingers or throbs, often at night, and root canal treatment or extraction is needed.
What is the tooth nerve?
In the centre of every tooth is the pulp, a soft tissue made of nerves, blood vessels and cells that built the tooth. People usually call it “the nerve”. It sits inside a hard shell of dentine and enamel and has very little room to swell. When it becomes inflamed, pressure builds up inside that rigid space, which is why pulp pain can be so intense.
What causes an inflamed tooth nerve?
- Deep decay that reaches or comes close to the pulp, the most common cause
- A crack or fracture in the tooth, sometimes invisible to the eye
- Large or repeated fillings on the same tooth
- A blow to the tooth, even years earlier
- Advanced gum disease reaching the root tip, less often
- Grinding or clenching that overloads a tooth
Decay is largely preventable. Good brushing, as explained in our guide to brushing your teeth correctly, and regular check-ups catch most problems before they reach the nerve.
Reversible or irreversible pulpitis: the key difference
| Reversible pulpitis | Irreversible pulpitis | |
|---|---|---|
| Pain | Short, sharp, triggered by cold or sweet | Strong, lingering, often throbbing |
| After the trigger | Stops within seconds | Lasts minutes or longer |
| Spontaneous pain | Rare | Common, especially at night |
| Outcome | Nerve can recover once the cause is treated | Nerve cannot recover |
| Usual treatment | Filling or sealing the tooth | Root canal treatment or extraction |
Only an examination can confirm which situation applies. Dentists use your description of the pain, cold and tapping tests and an X-ray.
Symptoms of an inflamed tooth nerve
- Pain that lingers for a long time after hot or cold drinks
- Throbbing pain that starts on its own, often waking you at night
- Pain that is worse when lying down
- Difficulty pointing to the exact tooth, because pulp pain spreads
- Sometimes relief with cold water, a typical sign of advanced inflammation
If the nerve dies, the pain may stop for a while. This is not healing: bacteria can then infect the root tip and cause an abscess, with pain on biting and sometimes swelling.
How is pulpitis treated?
For reversible pulpitis, the dentist removes the decay or replaces the leaking filling and protects the nerve. The pain normally settles within days.
For irreversible pulpitis, the inflamed nerve has to be removed. Root canal treatment cleans, shapes and seals the inside of the tooth so it can be kept. It is done under local anaesthesia and is usually no more uncomfortable than a filling; read whether root canal treatment is painful for details. If the tooth cannot be restored, extraction is the alternative.
Antibiotics do not treat pulpitis. They do not relieve pain from an inflamed nerve and are only useful if an infection spreads into the surrounding tissues.
What to do while you wait for an appointment
- Take a simple painkiller if it is safe for you, following the package instructions.
- Avoid very hot, very cold and sweet food on that side.
- Sleep with your head slightly raised, which can reduce throbbing.
- Do not place aspirin or other tablets on the gum.
- Seek urgent care if you develop facial swelling or fever.
Our guide to severe toothache gives more practical first steps.
Treating inflamed tooth nerves at Ajam Dental Clinic, Tripoli
At Ajam Dental Clinic, Fouad Chehab Boulevard, Al-Makateb Building, 1st floor, Tripoli, we examine the tooth, explain whether the nerve can recover and discuss the options. Root canal treatment and re-treatment are carried out at the clinic by a visiting specialist endodontist. See our root canal treatment and contact us by WhatsApp or phone if a tooth keeps you awake at night.
Frequently asked questions
Can an inflamed tooth nerve heal on its own?
A mildly inflamed nerve can recover once the cause, such as decay or a leaking filling, is removed. It does not heal while the cause is still there. When the inflammation is irreversible, the nerve cannot recover and the pain usually returns or the nerve dies, which can lead to an abscess. An examination tells which situation you are in.
Why does my tooth hurt more at night?
When you lie down, blood pressure in the head increases slightly, adding pressure inside the tooth, where the inflamed nerve has no room to swell. You are also less distracted at night. Throbbing pain that wakes you is a typical sign of an irreversibly inflamed nerve and is a reason to book an appointment soon.
Does cold water relieving the pain mean anything?
Yes. When cold water calms a throbbing tooth, it often means the inflammation is advanced, because cold reduces pressure inside the tooth. It is a useful clue for the dentist but not a treatment. The tooth will usually need root canal treatment or, if it cannot be saved, an extraction.
Is root canal treatment the only option for an inflamed nerve?
For irreversible pulpitis, the options are root canal treatment to keep the tooth or extraction. Leaving the tooth untreated is not a safe option because the nerve usually dies and becomes infected. In reversible pulpitis, a filling or protection of the nerve may be enough.
Can an inflamed tooth nerve cause headaches or ear pain?
Yes. Pain from the pulp is often poorly localised and can spread to the ear, temple, jaw or even the opposite jaw on the same side. This is why patients sometimes cannot tell which tooth hurts. Tests and an X-ray help the dentist find the source.
Have a question about your teeth?
Send a WhatsApp message to Dr. Abdel Rahman Ajam or Dr. Soumaya Ajam, or call the clinic to book a consultation.
This article provides general information for patients. It does not replace an examination by a dentist, who can advise you on your own situation.
