Sample: 120 patients from the Cardiology Department of Hospital Severo Ochoa (Leganés, Madrid) suffering from established cardiovascular disease and generalized moderate/severe periodontitis. Sixty patients will be randomized to test group (scaling and root planing + systemic antimicrobials), and the other 60 subjects will be included in the control group, consisting on delayed periodontal treatment (supragingival prophylaxis + placebo).