We use Clinica Dental, in Tortosa near Lidl.
We see a nice young male dentist who speaks very good English, and is very helpful.
There is a lady dentist aswell named Montserrat.
Have seen lots of other Brits in there too, using both of these dentists. So shows they are good and reasonable.
Think the full x.ray and check up cost about 60 euro?
If you need any other treatment he will give you a print out of costs. They also send a message to your mobile to remind you of your appointment.