for example i paid £70 for a filling a few years ago which fell out and cracked the tooth and it only cost me £30 to have it fixed in Poland.
Cheap for the foreigner, but expensive for the Pole.
If you compare wages, that would be the same as paying £90-120 for the same filling in the UK on average UK wages.
My last dental bill was 18 months ago, and my next one will be about £180 for two fillings (both private), X-rays, cleaning, and check-up (remainder on the NHS).
It makes me laugh when people complain that they "can't afford" dental treatment over here, when they are quite happy to spend £12 on a piece of cheese and tomato on toast.