I've bitched about school work but that doesn't mean you're somehow entitled to money. No one forced you to go into school and study so stfu. If dentists are entitled to lots of money because they study a lot how much do PhD's deserve to make?
Of course construction workers and dentists are different. But what you were talking about was "energy expended and stress output" which is a joke.
You and most people in fact have NO IDEA how GRUELING AND INSANE dental school is. It is so challenging emotionally and intellectually as well as physically when you don't get to eat a proper breakfast because you overslept because you were up late until 3 am doing lab work. Then you have a science core that is probably more intense then med schol to worry about. Construction workers show up, watch others do work, take a smoke, then go home and relax. Plus they aren't performing a service that improves and (ultimately) saves lives.