Reversible pulpitis is characterized by pain that is triggered by stimuli such as cold, heat, or sweets and rapidly subsides once the stimulus is removed. This occurs because the inflammation is limited and the pulp tissue is still viable and capable of recovery. In contrast, irreversible pulpitis causes spontaneous or prolonged pain that does not resolve quickly. The key clinical point is that reversible pulpitis allows pulp healing if the irritant is eliminated, making the pain transient and stimulus-dependent. This distinguishes it from more severe conditions that cause persistent pain.

Reference: Oral Pathology for the Dental Hygienist, 7th Edition.