Do dentist dislike treating NHS patients over private patients?
Not really (although you might find one bad apple). All the private dentists I know do it for 2 reasons. Firstly because they can spend more time with their patients rather than the stereotypical conveyor belt system a lot of NHS practices end up like. Secondly because they can offer more treatments i.e. white fillings in back teeth, chrome dentures etc. The only thing you will really miss out on in the NHS is some of the more expensive alternatives.