Every time I've ever had work done here in the US, they would do something on my teeth, then switch rooms and work on someone else for a bit, then come back, et

Every time I've ever had work done here in the US, they would do something on my teeth, then switch rooms and work on someone else for a bit, then come back, etc. Sometimes they'd have a hygienist doing something else, but other times I'd just be sitting there waiting. It seems fairly common.