Chill out tooth pain: cold saline injection beats ice water after root canal

This study tested two ways of using cold therapy (cryotherapy) to reduce pain after a root canal in people with severe toothache. Forty-five adults with an infected lower premolar were divided into three groups: one got a cold saline injection near the tooth, another had ice-cold water placed inside the tooth canal, and a third received standard care. Pain levels were measured at 12, 24, and 48 hours after treatment. The goal was to find which cold method works best for easing post-procedure discomfort.