Pulpitis can pathologically be divided into reversible pulpitis and irreversible pulpitis. Reversible pulpitis can sometimes heal on its own if external thermal stimuli are removed. Clinically, it may manifest as pain intensified by temperature stimuli, which disappears after the stimuli are removed. This condition can improve on its own with appropriate soothing treatment. If pulpitis progresses to irreversible pulpitis, it cannot heal on its own and requires prompt root canal treatment to alleviate the condition. If it worsens, it may lead to symptoms of apical periodontitis, hence root canal treatment needs to be performed as soon as possible for pulpitis.