Sometimes by 20%. Sometimes even more — in one case 70%!
I asked why and the reason given was “It was an easy filling/extraction so I thought that I would give a discount.”
This sounds plausible until I asked one simple question:
“So, if you charge less when a filling/extraction is easy, do you charge more when it is difficult?”
That cast a new perspective on things. The answer was that they never increased the fee.
Bottom line is this: If your fees are fair then charge them — don't discount.