Pulpitis: reversible or irreversible
- Oral pathology
Pulpitis is inflammation of the tooth nerve. If the pain to cold is brief, the nerve can recover; if it lingers or comes on its own, it usually cannot.
What it is
Pulpitis is inflammation of the dental pulp, most often from deep caries, but also from cracks, trauma or recent dental work. In reversible pulpitis the pulp is inflamed but can recover once the cause is removed: pain is sharp, provoked by cold or sweet, and stops within seconds. In irreversible pulpitis the inflammation will not resolve: pain is intense, lingers after the stimulus, comes on spontaneously, often wakes the patient and can be hard to localise or radiate to the ear or temple. Without treatment it progresses to pulp necrosis.
How to recognise it
- Reversible: brief pain to cold or sweet, no spontaneous pain, normal to percussion.
- Irreversible: lingering pain to cold or heat, spontaneous or night pain, may radiate.
- Pain on lying down and relief with cold water suggest advanced irreversible pulpitis.
- Localisation may be poor until inflammation reaches the periodontal ligament (then the tooth is tender to bite).
- Antibiotics do not relieve pulpitis pain, because the problem is inflammation inside a closed space, not spreading infection.
Differential and risks
- Prescribing antibiotics for toothache without swelling or fever is a common error: it does not relieve pain and drives resistance.
- Combined ibuprofen and paracetamol relieves dental pain better than opioids.
- Pain that suddenly stops after days of severe pulpitis may mean the pulp has died, not healed.
Next step / Initial management
- Reversible: refer to the dentist to remove the caries and restore the tooth; simple analgesia meanwhile.
- Irreversible: refer to the dentist promptly for pulp removal (root canal treatment) or extraction; this, not antibiotics, cures the pain.
- Give an NSAID, with paracetamol if needed, unless contraindicated; avoid antibiotics without swelling, fever or spreading infection.
Test yourself
Think of the answer, then tap the question to see it.
What features suggest irreversible rather than reversible pulpitis?
Pain that lingers after the stimulus, spontaneous or night pain and radiating pain.
Do antibiotics relieve the pain of irreversible pulpitis?
No. The definitive treatment is removing the pulp (root canal) or extracting the tooth; analgesics relieve pain meanwhile.
What may sudden relief after days of severe pulpitis mean?
That the pulp has become necrotic, which then risks apical periodontitis and abscess.
Connections
In Pharmacology2
Educational content; it does not replace assessment by a dentist or doctor and is not a clinical instruction. For facial or neck swelling with difficulty swallowing or breathing, a knocked-out tooth or bleeding that will not stop, go to an emergency department at once.
Sources: Anatomy, Head and Neck, Dental Pulp (StatPearls Publishing (NCBI Bookshelf), 2025); Dental Emergencies (StatPearls Publishing (NCBI Bookshelf), 2022); Dental Caries (StatPearls Publishing (NCBI Bookshelf), 2023).
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Representative model, for educational purposes only.