[schiang]

It probably depends on the dentist. I've never even see a dental hygienist at my dentist's office. It's always the dentist that does everything.

[astura]

That's extremely unusual, I've been a patient at probably 20 different dental practices and I've never had a dentist do the cleaning, only the dental hygienist.

[ghaff]

That's not the norm in the US. Maybe some old-timey solo practices but having dental hygienists do cleaning is all I've ever seen.