^Did they start using flouride in the water supplies again?
Nope...
http://en.wikipedia.org/wiki/Fluoridation_by_country
Nowadays public drinking water supplies are not fluoridated in any part of Germany.
In 1952, Kassel-Wahlershausen, in the FRG (West Germany), became one of the first two places where water fluoridation was practiced in Europe. By 1962, no other part of the FRG was fluoridating,[35] and Kassel-Wahlershausen discontinued the practice in 1971.[citation needed]
In the GDR (East Germany) in the late 1980's, about 3.4 million people (20%) were receiving water with added fluoride. Fluoride tablets were also provided.[45] The fluoridated areas of the GDR included the towns of Karl Marx Stadt (now Chemnitz), Plauen, Zittau, and Spremberg. Children in those towns were part of large long-running studies of caries prevalence.[46][47] Water fluoridation was discontinued after the German reunification.