Introduction E-cigarettes are battery-operated devices that heat up chemical solutions, which are referred to as liquids. Aerosols in different flavors are produced, many of which can contain nicotine. A survey in Germany indicated a population of 1,4 % that use e-cigarettes regularly, which corresponds to approximately one million people in Germany. The main users of e-cigarettes are between the ages of 20 and 60 years. The American PATH-study of 2018 indicated, that 1,7 % of participants solely smoked e-cigarettes and 1,4 % smoked cigarettes as well as e-cigarettes in their daily lives.. E-cigarettes are a common and established phenomenon in the population. Due to frequent use and recent development, the question is raised of what effect this has on oral health.