Hii, I only have experience with medicine but my cousin was in your situation except she had A*A*A*A and 12A* for GCSE and a high UCAT score, she applied for dentistry 3 times and got rejected each time and now she's finally doing something to become a dental assistant but I'm not sure exactly what course. I know dentistry is far more competitive than medicine so I would recommend taking a gap year and hopefully it works out, if not I think its better to just have a backup plan, and also really consider your uni choices I think its best to not apply to all the competitive ones at once. My cousin applied to all the London unis because she didn't want to move out, but I thought that it was a bit of a risky choice considering how competitive they are. Hope it helps and good luck!