This study was designed to compare shear bond strength durability of two etching techniques, conventional etching and self etching primer technique. Ninety extracted premolars was divided into two equal groups (group 1: etched with 35% Phosphoric acid and group 2: bonded with transbond plus self-etching primer, each group was further subdivided into three subgroups each of them containing fifteen teeth, at different storage time, for 24 hours, 30 days and 3 months. Universal testing machine was used to measure shear bond strength. T-test revealed that there was no significant difference in shear bond strength between the two etching techniques at 24 hours and 30 days, while showed a highly significant difference (P ≤ 0.01) at 3 months. For the three storage time, self etching primer showed less adhesive remaining on the teeth than that of Phosphoric acid etching. It could be concluded that self-etching primer provided shear bond strength Comparable to that of phosphoric acid, and less adhesive reminant than conventional etching technique.