When you have been working in dentistry for over 30 years, you realize that periodontology should be the basis of all disciplines in dentistry. In periodontal treatment, the most important treatment goal is tooth preservation and the establishment of inflammation-free soft tissue. This also applies to implants, which are increasingly used as a prosthetic restoration in many patients. In order to achieve these goals, a biologically oriented scientific training is necessary, which must be combined with the learning of manual skills. This interdependent theoretical and practical training is the prerequisite for the diagnosis and treatment of periodontal and peri-implant diseases. The master program M. Sc. Periodontology in Aachen combined the biologically oriented scientific knowledge with the improvement of manual skills and thus serves to prevent and treat periodontal and peri-implant diseases. I look forward to share my knowledge with you and I am sure that after the master program we will improve the treatment of our patients.