Hi there,
I agree with vicki Nhs jobs will be where u need to look at. You could email or phone the hospitals principal dental nurse/ dental nurse manager ask if there are any positions to come up soon or if you could have a visit organised to observe. I work in hospital in Edinburgh and I was up against a fair few other dental nurses so they can get very popular if it's a position in oral surgery they will more often need a nurse with their sedation certificate as they have IV sessions.
Good luck with the hunt! Hope u get the job your wanting.