They are very friendly and do about the best that can be done for procedures that are inherently not fun. No one WANTS to go to the dentist, but they make it about as painless as possible (or maybe least miserable).
One comment that comes to mind is that I noticed during a procedure that the dentist was jiggling my cheek. It didn't really occur to me this was happening at first, but when I realized it, I also realized that there was a needle in my mouth to numb the area. I think the jiggling was a productive distraction that made me not notice the needle injection. While the jiggling might serve another purpose (maybe to promote circulation of the medicine?), the pain distraction is encouraging in my opinion. I've donated blood and had blood work before and very few nurses (to my surprise) do anything from distracting you before putting in the needle. Pain always hurts more when one is expecting it. Any type of technique that can distract your attention and relax from a needed painful medical procedure is a plus in my book.