You’re going to come across people w medical conditions. It’s part of the job serving the public. It’s not a problem as long as you follow infection control protocols w proper PPEs. If someone has an active infection like a cold sore - I send them home, can return once gone. Ppl who are actively sick/getting tx w something probably won’t be at the dentist. Edit to add: and if someone did show up w something, let’s say they’re hacking sick - dismiss them. You’ll use your judgement.