Dear Lucy,
Glad to hear you are thinking of the future. As for career progression, some of the assessors on the network are probably best to advise you, but as for me I've been nursing in practice for 19 years, and so far, as well as my nursing qualification I've also done radiography and oral health education. My current practice doesn't do sedation, so the qualificaion isn't relevant at the moment. HOwever I would encourage any nurse to gain as much experience and extra qualifications as poss, you never know what the future holds. I was given practice management responsibility last summer but still nurse and hold OH sessions, so i'm quite busy. Check out your local colleges or postgraduate courses to see what courses or additional training eg impression taking, flouride appliction etc they offer, any good practice should support their nurses when it comes to additional qualifications.
Good Luck