Hi,
I live in Spain and it is much cheaper here - afraid I cant quote you figures, however have heard that it is much cheaper than the UK. Incidentally I am not talking about dentists on the coast ie Marbella - Puerta Banus. I am talking about inland. I live in Granada, and have heard nothing but good re Spanish dentists. From basic fillings - tooth whitening - gum disease treatment etc, all much cheaper. I wish I had known this some 7 years ago, it cost me £3000.00 to sort out a gum problem - needless to say a sore point !! No pun intended. My local dentist also speaks perfect English.
Hope this is maybe of some help to you.