DH and I both had check ups last week, which had been postponed twice. We haven't been going anywhere much so had to trust that all would be OK.
Hygienist, dentist and nurse all wore aprons, visors, gloves and masks (we didn't wear masks for obvious reasons). We had to knock and wait to be let in then sanitize our hands. No queue in the waiting room just a single chair outside the surgery. Everyone was pleasant and friendly as usual.
DH had to go back for a procedure that required a drill and, consequently, spray in the air. Dentist and nurse were in full PPE but they were laughing about it. I have to go this week.
No need to feel nervous. I think they've thought it all out carefully and you should be fine.