A surgical instrument for supplying energy to tissue can comprise an end effector comprising a first jaw member and a second jaw member, wherein at least one of the first jaw member and the second jaw member is movable relative to the other of the first jaw member and the second jaw member to clamp tissue intermediate the first jaw member and the second jaw member. The instrument can further comprise an electrode configured to generate heat when electrical energy is supplied to the electrode, and, in addition, a tissue-grasping portion comprising a plurality of teeth, wherein the tissue-grasping portion is comprised of an electrically non-conductive material.