Of course it is cheaper ,,,We come from Australia ( air ticket about $ 2500) to do our teeth in Serbia ( among other entertainment, ha-ha).I mean really if you have some mayor dental work to do even coming from Australia will save you money. I don't know about implant now but I remember when implant was here in Australia $5000 and friend did it in Serbia for 500 Euros. Problem with implants is that you should stay too long there if you want to do it and one thing we lack is time. For other dental works it will all take few days. There are all kinds of dentists in Serbia, some have modern surgeries (technologies), some not. But they are good dentists because Belgrade University used to be respected all over the world... I suppose it's similar with Hungary and other Eastern Europeans.
They have mobile dentists here in Australia (state service for school children) in trailers but I've never heard about tents...

(B'lated comment)

'Dental tourism' is pretty strong here for two decades now: first Austrians, then Germans too, then Italians and French. That now Britons are part of it only means that the travel sphere grew further. I am guessing that the transport (and customs) integration of the EU and low-budget airlines had the main roles in this.

_{*Lunatic*, n.
One whose delusions are out of fashion.}