There is an extremely interesting article posted by Ross Slater over at http://www.mirror.co.uk/news/top-stories/2009/08/24/private-dentists-mirror-investigation-finds-treatment-varies-wildly-115875-21619929/.
The article discusses how Ross went to visit six (6) different private dentists in the UK after having not seen an NHS dentist for over a year. He wanted to see what they would say about his teeth and not all the dentists that he had no current problems with his teeth.
The results were quite surprising. As the number of fillings recommended varied from zero (o) to five (5). The total bill was also wildly varied at each dentist as was the teeth that needed fillings when it was told one was needed. Read the entire article if you are interested to learn more about the varying dental care found.