Err to my knowledge that would be incredibly difficult, and there are lots of things you have to take into consideration -
1. Not many people can go from a CCD to AAA or A*AA, which is the equivalent of jumping 2/3 grades per subject. You'd have to work incredibly hard to do that (which I'm sure you can
)
2. Most dental schools don't allow resits. Universities like Glasgow have a strict no-resit policy (under basically any circumstances) in terms of dental admissions, and most (if not all) will only accept resits if the candidate has extreme considerations (ie a family member death/medical issue) Schools that do allow resits typically will only allow resit applicants if they get a minimum of AAB at your first go, and if you previously hold an offer (as firm choice). So that, realistically speaking, cuts out your chances significantly. The only dental school I'm aware of in the UK that is possible in your scenario is Bristol, but even with that I'd email admissions to find out more details. So unless you are a current offer holder from Cardiff (specifically), and have firmed your place as first choice, which will allow resits and defer your place if you don't meet the grade requirements, I'm not sure how else resits would be considered.
3. Mature students, despite accounting for a high proportion still do have a minimum standard requirements at A level(For a couple of dental schools, there may be one or two exceptions but I cannot confirm this so make sure you do more research). Resits are resits, and even if you apply for mature entry that resit will still count.
4. Postgrad entry, or a conversion course (DHT) is something you can potentially use as an avenue to get into dentistry. I'm a little less clear on post-grad entry, but from what I read before - Some universities will not count your A-levels and only use your graduate degree honors, e.g. King's, but other universities will also have a requirement of a minimum grade at A-level, e.g. For Queen's Belfast, there is a min grade of BBC at
first attempt. (I don't actually know if resits count in this matter for
all universities, so I would email universities asking if I were you) So if you're applying then I would make sure to do ample research
I'm not sure if you qualify for widening access, but if you do it is worth a shot applying via those programmes and try to get in, because you have reduced grade boundaries. If there was anything else affecting your performance during the exam, which you mentioned above, on any potential special circumstances that you had during that period, you could also try and get grade improvements via those. Again, all of the above advice goes out the window if you qualify for an extreme circumstance that you think justifies why you got these grades. There may be programmes I'm unaware of that may accept this case, so
in any event I would still send out emails to all universities offering a dental programme regarding this situation and what can be done.
@drdent have you got any advice? I'm less clear on mature entry/enhanced entry/grad entry?