Bacteria destroy the tooth structure and eventually reach the pulp chamber. The pulp consists of nerve fibres, blood vessels, lymphatic vessels, and connective tissue. When infected by bacteria, it becomes inflamed in an attempt to defend the body. If this fails, the pulp begins to die, leading to a purulent infection of the tooth. If bacteria spread beyond the pulp into the jawbone and surrounding soft tissues, characteristic swelling occurs. However, the dental nerve can also be damaged by other causes, for example, dental trauma, known as traumatic pulpitis. Dentists distinguish between reversible and irreversible pulpitis:
- In reversible pulpitis, there is still a good chance of recovery, as the inflammation can be reversed.
- In irreversible pulpitis, the damage is too extensive to heal, and the dental nerve must be removed through root canal treatment.
In reversible pulpitis, the tooth responds to hot, sweet, cold, or acidic stimuli with short, sharp pain. In irreversible pulpitis, patients often suffer from constant, throbbing pain, which can be difficult to localise, making it hard to identify the affected tooth. In both cases, Immediate dental treatment is strongly recommended to prevent complications.