Yes, unless you want to switch dentist (and move all the way across the country) I wouldn't do anything to upset her
Besides, i have the nasty feeling that medical people tend to know each other quite well, so not even that might help.
It's hard to argue in a dentist's surgery, but in most medical rooms I might charge extra for the risk of catching any germs, especially If I had to work around patients (which is admittedly unlikely to happen).
On a more technical note: so you're one of the forums' few defenders of the ring mains? I think most of the Brits here admitted they prefer radials a while ago.