GSTM1 and diabetes mellitus: The likelihood of having Hb A1c <7% inparticipants who had information about the effect of periodontal disease on diabetes was about three times more than those who had no information (OR= 3.05, p= 0.036).Furthermore, it was about six times higher in participants who used dental floss once a day or more than those who used rarely (OR= 5.66, p= 0.001).