sentences:  This tradition is intended to prevent dental caries, but its history contains questionable medical ethics - it is the result of the "Vipeholm experiments", in which mentally challenged patients were unwittingly used as test subjects of experiments in dental health.Swedish alcohol habits vary greatly during the week - Swedes expect each other to be completely sober during work hours (even one beer for lunch is taboo), but many people drink heavily during weekends.See also alcohol in Sweden.