Petrovic MS, et al. - Herein, low-level laser therapy (LLLT) was tested as an adjunct to periodontal therapy in the treatment of chronic periodontitis, focusing on the microbiological, cytomorphometric and clinical efficacy. In this clinical prospective study, short-term additional bacteriological, cytological and clinical benefits were obtained when low-level laser therapy was used as an adjunct to periodontal therapy.