I went in for a deep cleaning on the second side of my jaw (I had the first side worked on the previous week). The dental hygienist that attended me this time was quite different from the first. She did not wait long enough for the initial numbing to take place before injecting me with more anesthesia. I felt the injections much more than the first time. When I mentioned this to her, she said, "Oh, you're GOING to feel this." I remarked that last time, in fact, I did not. Her reply, "Well, we each do things differently."
The first hygienist offered me splash-guard glasses to use during the procedure, which helped. The second hygienist did not. The difference was quite noticeable. The first hygienist offered me earplugs to combat the high-frequency cleaning; the second didn't. The first kept checking in with me on a regular basis to see if I was doing well; the second didn't.
So, yes, they each do things regularly.
The second hygienist seemed to work more efficiently, as I was finished sooner with her, than with the first. However, I still feel sore (this is Wednesday at 8:30am, and I had the procedure on Monday at 4:30pm) days later, compared to the first visit. I would rather trade comfort for speed any day.
The onus is on me, then, to ask to be worked on by a particular dental hygienist in the future.
Besides this, the front office was very efficient; I was admitted and charged quickly. Afterward I was given a flexible schedule for a follow-up.