Fig. 2From: Efficacy of hyaluronic acid gel and photobiomodulation therapy on wound healing after surgical gingivectomy: a randomized controlled clinical trialThe delivery tip of the diode laser device applied perpendicular to the gingival tissue surface at 1 cm distance. a. shows the application of PBM on the 3rd day after surgery. b,c, and d shows the applied tip at exact distance from 12 o’clock view, frontal view and lateral view respectivelyBack to article page