Work / Can I take accreditation easily in Poland? [3]

Hello everybody. I am a paediatric dentist in Turkey. I am planning to move to Poland for work. I was searching information about Poland and came across this site. I want to learn whether it is easy for a non-EU citizen to take accreditation and perform his/her job as a dentist (I mean working in a faculty as a researcher ) in Poland or not ? Do I have to first get proficiency in Polish language or will English be enough? Can I get permission for work from Polish government easily? Can I find part-time jobs? I would be thankful if you informed me about these issues. Thank you.