Could a simple injection make root canals less painful?

This trial tests whether a corticosteroid injection given before root canal treatment can reduce pain and inflammation afterward. One hundred adults with symptomatic pulpitis (tooth nerve inflammation) are randomly assigned to receive either standard root canal treatment alone or standard treatment plus a submucosal injection of betamethasone and gentamicin. Researchers measure pain levels and inflammatory markers in the gum fluid over four days to see if the injection helps.