I do definitely believe that dentistry - especially in the form of pain control - has improved massively in the last decade or so. And dentists themselves have become better at reassuring patients and ensuring that pain is kept to a minimum, I think.
Things have certainly improved since the time I went to the dentist several decades ago and he stood in front of me with a very large needle and said: "This is going to hurt like hell and it's your own fault for not coming to me sooner."
It did, too. Needless to say, I changed my dentist shortly thereafter!
LabRat