Clinical and Microbiological Aspects of Probiotics in Non-surgical Periodontal Therapy.

The goal of this randomized clinical trial is to test the effect orally administration of Probiotics based on Lactobacillus rhamnosus LR04 and Lactobacillus plantarum LP14 as adjuvant in people suffering from periodontitis stage II-III. The main questions it aims to answer are: * QUESTION 1: orally administered probiotics based on the previous strains could represent a useful tool in support of non-surgical periodontal therapy in reducing clinical periodontal indexes? * QUESTION 2: orally administered probiotics based on the previous strains could represent a useful tool in support of non-surgical periodontal therapy in reduce the amount of periodontal pathogens in periodontal pockets? Partecipants in the test group will take the test probiotic for 90 days in adjunction of the routinary oral hygiene procedures. Partecipants in the positive controlled group will take the placebo for 90 days in adjunction of the routinary oral hygiene procedures. Partecipants in the negative control group will perform only the routinary oral hygiene procedures. Researchers will compare 3 groups to see if orally administered probiotics based on L. rhamnosus and L. plantarum may hel in the reduction of periodontal indexes and of the periodontal pathogen bacteria.