Investigating the effectiveness of scaling/root planing (SRP) plus 1064 XLASE (Fotona LLC, Dallas, TX) diode laser therapy (SRP+LASER) compared to SRP only (SRP ONLY) in the treatment of moderate-to-severe (Stage II–III) chronic periodontitis by comparing clinical crown lengths (CCL), probing depths (PD), bleeding on probing (BOP), and bone level (CBCT scans) at pre-treatment and 12 to 18 months post-treatment.