I was a shielder and this worries me:
The issue is that dentist’s offices create huge amounts of saliva droplets. “Look at some of the instruments that they use, such as the drills, the scalers, the air-water syringes,” says Kullar.
https://elemental.medium.com/read-this-before-you-go-to-the-dentist-7385e2580c966_
When used in the mouth, all of these instruments create sprays of tiny droplets and aerosols containing not only water but saliva — which contains high levels of viruss, blood, and microorganisms. The smallest of these particles can stay in the air for hourss, while larger ones can land on surfaces like doorknobs and dental chairs.
Together these characteristics make aerosolised oral secretions powerful potential vectors of COVID -19 in dental practices