“…Dry socket is a very common complication follows dental extraction [1] with pain is the most important clinical issue but with a great controversy about the efficacy of its treatment methods [2][3][4][5] . Of these treatment modalities, ozone was utilized in a limited number of researches with promising results [9,13,14] due to capability to deliver oxygen to the ischemic tissues, and therefore, improves the metabolism and the healing and activates the immune system [7][8][9][10][11] . However, researches to compare the efficacy of different forms of ozone to treat DS is not enough [17] .…”