My dentist office has been doing cleaning during at least the past year during the pandemic. They had air sanitizer machines in each room and only used every other room to keep the number of people being worked on to a low number. They wore lots of PPE and did lots of sanitizing of rooms between uses.
For most of that time, the teeth cleaning was only teeth scaling but no polishing or use of the water pik due to concerns about aerosolized particles. Just a couple months ago when I was in for a teeth vleaning, they finally had started using the polisher and the water pik again.
They also did procedures like fill cavities and crowns and they used a special air suction funnel held near the patients face to try to collect any aerosolized particles that were created due to the need for using the water spray nozzle and the drill.
Prior to any dental procedure, they required the patient to rinse their mouth with a really foul tasting solution that killed any bacteria and also viruses such as covid before they started the dental procedure. That is the most disgusting mouth rinse that I have ever encountered.