New stages in life require extensive preparation. Especially for first-year students, the new semester is of great importance. A first own apartment or shared apartment, a new city, strange buildings and new acquaintances. People greet each other with a smile, tell each other about themselves and make important acquaintances, possibly even for years to come. In order to appear as open and likeable as possible, people take a shower, perhaps get a new haircut and take the best outfit out of the closet. A glance in the mirror, however, reveals that something is missing. But what is missing to make the best impression on others? That’s right, sparkling white teeth.