Services for kids: 2 German-speaking places
The results of searching for "Zahnarzt": 2 German-speaking places
There are also organizations that speak other languages: Russian, and English.
Wiener Platz 4 51065 Kreisfreie Stadt Köln Germany
Kölnstraße 54 53111 Nordrhein-Westfalen Köln Germany
Services for kids 
Doctors and clinics