Oppliger, Nathalie, Barbara Roth, and Andreas Filippi. 2014. “Knowledge of Halitosis Among Dentists and Dental Hygienists. : A Comparison Between Switzerland, Germany, and France”. SWISS DENTAL JOURNAL SSO – Science and Clinical Topics 124 (2): 133-38. https://doi.org/10.61872/sdj-2014-02-01.