This research was carried out to assess Diode Laser(DL)therapeutic effects on chronic periodontitis, by reducing pockets depth and minimizing Microbial Counts (MCs). Patients(Pts)under study were 50Pts, they had chronic pockets periodontitis of more than 5mm depth, were divided into 35Pts study group(SG) and 15Pts control group(CG). All Pts were subjected to scaling, SG received DL therapy, CG ...