1. Unit of Periodontology, Endodontology and Restorative Dentistry, Department of Medical Biotechnologies University of Siena Siena Italy
2. Department of Surgical, Medical and Molecular Pathology and Critical Care Medicine University of Pisa Pisa Italy
3. Sub‐Unit of Periodontology, Halitosis and Periodontal Medicine University Hospital of Pisa Pisa Italy
4. Department of Surgical Sciences C.I.R. Dental School, University of Turin Turin Italy
5. Polytechnic of Turin Turin Italy
6. Faculty of Odontology University Complutense Madrid Spain