Keeping the above facts in mind, the goals of this study were to (1) evaluate in situ gel as a vehicle in a local drug delivery system, (2) evaluate the efficacy of moxifloxacin for local drug delivery, (3) evaluate the efficacy of gellan gum for in situ gelation of moxifloxacin, and (4) evaluate and compare the clinical and microbiological parameters of moxifloxacin with those of the gold standard, chlorhexidine di gluconate.