My dentist called to tell me they won;t treat me unless an emergency as they feel my valve makes me a risk. I laughed and told them I was not planning on coming in unless there is a pill to cure or vaccine to prevent the virus or my tooth is hanging out of my mouth.
That said I believe the ADA is recommending that they use a N95 mask covered by a ASTM level 3 mask and should be wearing a face shield on top of that.
I actually work for a dental chain here in US and I know that is the procedure we are following and we have been following ADA lead. Rather ironic that I hope our patients come back so I can stay employed, but you could not pay me enough to go to a dentist right now.
My dentist is asking patients to call from car and stay in it and call from there. They will call you when your appointment is ready as they have closed their waiting room.
These are all good practices, but in the end the thought of laying there, face up, mouth wide open as a catch basket for whatever is flying around in the air is not a risk I am willing to take. I am paranoid, I double mask and glove when out in public, gloves, etc. I keep masks and dozens of gloves in the car just in case. I am anal on how to take the mask and gloves off and dispose of them.
As ATHENS1964 said if you must go take first appointment. I have echo for my heart and I waited until June to get the first appointment of day. I still may cancel that sincethey are still using their waiting room, I asked about waiting in car until my appointment and they said that is not the process currently.