Hmmm and how many of these have you done?

As someone who has actually performed this procedure, I can tell you it is not at all that easy.

Let's try doing what you did with some other things.

"Why does space travel cost so much? Just put some scientists on a rocket, press the button to launch, and there they go, a couple hours of work."

"Why does it cost so much to fix my computer? Just press a couple buttons and it's fixed, that's like 5 minutes of work and it's not even hard"

You see, you're forgetting about the 8-12 years of post high school education. You're forgetting about the $300k that dental school cost me. You're forgetting that the assistant holding suction the whole time has kids that need to be fed, oh and they nice ladies up front you greeted you and called you to remind you of your appointment? They want to eat too. Oh and that chair you're in cost $5000 because it's for dentistry. Then you probably wanted clean instruments for your procedure, so I am also paying a couple people to be sterilizing instruments all day.

The overhead for a dental practice is huge because everything is expensive, and we employ a lot of people.

We also work for years before we ever get paid, so we need to make enough to cover those loans and their interest rates too (which aren't low anymore--why do people think my student loans have no interest or only 2%?)