The goal of this observational study is to evaluate non-surgical periodontal treatment in women and men with periodontitis with and without obesity. The main questions it aims to answer are: * If non-surgical periodontal treatment of patients with chronic periodontitis can modulate the innate and adaptive immune response taking into account patient gender and the coexistence of obesity * If there are specific miRNAs that can regulate this immune response and can be considered as suitable biomarkers and therapeutic targets. Obese or non-obese participants with periodontitis will receive non-surgical periodontal treatment, consisting of oral health guidance and mechanical periodontal debridement throughout the mouth using an ultrasonic device and manual curettes. Researchers will compare four groups: obese women, non-obese women, obese men, and non-obese men, to clarify the involment of immune response after treatment, considering the coexistence of obesity and potential gender differences.