There's only one dentist I would trust - dentopolis-poznan.pl/
They did a great, great job with an emergency dental operation on me a while ago - and I've used them ever since. The nice thing is that the prices are on the website, so there's no surprises.
Steer clear of anyone with the name "exclusive" or "luxury" and so on - it's likely that you'll pay a fortune for a nice waiting room and the treatment will be rubbish.