As above, it will be quite difficult to get in-person dental work experience at the moment so I’d have a look around for online/virtual opportunities too.
However, that shouldn’t stop you from trying to look for work experience. I did work experience at my dentist - I (or rather, my mum) asked him at my appointment and he agreed to it, so it was as simple as that. Alternatively you could email lots of practices, call or visit in person and ask if they have any work experience opportunities.