Q. Hi i have 8 crowns which need replacing also a bridge.i have visited a private dentist and seen my nhs dentist .i have been given different opinions ,after having xrays 2 dark shadows show there are pockets of infection due to unsuccessful root treatment 18 yrs ago.this has never given me a problem and i was not aware of it.one dentist says i should re do the root treatment before replacing the crowns the other says not to touch it as its never bothered me in all these years.what is your opinion on this.also one priced for lava crowns and the other would be nhs,do you think there would be any noticeable difference in them.i really cat decide if its best to go with the private one or stick with the nhs.is it the case that a nice swanky practise with more up to date facilities can give a better result.please help im very confused, thanks