Metformin is an oral hypoglycemic drug categorized under biguanide and are considered the most efficient agents widely used in the treatment of type 2 diabetes mellitus.The general clinical benefits observed in therapy with MF seem to be greater than expected. They induce osteoblast cells to promote early bone formation through AMP kinase (AMPK) activity. Moreover, in a recent in vitro study, MF facilitated in the proliferation of MG63 osteoblast like cells. Thus, their action in stimulating bone formation has justified their use in the treatment of perimplantitis.