Actually is it not so simple.
My dentist sent all patients an email which explained some of the changes they have to implement and referred to the guidelines they are required to follow. I went and found those guidelines.
This is just one...
For aerosol-producing proceedures (think cleanings, cavity fillings etc) the room the proceedure is done in has to be able to be SEALED afterward. I don't know about your dentist's office, but mine has rooms but no doors for most of the rooms [consider in contrast to the orthodontist office which is largely an open space]. They now have to install doors [they are allowed temporary ones as long as they meet certain requirements], and it has to be floor to ceiling coverage that is blocked/sealed -- I think of my dentist's office with its high ceilings, it isn't as simple as "just" installing a door.
Then, that sealed room has to sit unoccupied for a specified period of time BEFORE anyone is allowed to go in and clean it. The default time is THREE HOURS. That time can be reduced if they install a properly set up medical grade HEPA filter system for the room. At best, they can get the time down to 15 minutes with the use of HEPA. This is what my dentist's office is doing. Their HEPA system(s) won't arrive for another 4 weeks, so they can't open yet.
This is just one part of the requirements. I'm not trying to justify the amount of the extra cost to the patients, just explaining that it is not as simple as wait fifteen minutes then go in and clean and things are not much different than before. Things are quite a bit different than before in many large and small ways.
SW