In the Netherlands dental service prices are set by the government [1]. Under 18 are universally covered by basic health insurance; for adults average dental for regular work + emergency is 30/month.
But at a consumer level it's still quite difficult to predict what your total out-of-pocket expense will be for the same course of treatment at two different facilities.
Oh wow. Appreciate the correction. I wonder what improvements in price transparency Trump has in mind. Perhaps it's that website in the parent comment.