Oddly enough, I was asked to weigh in on this so let's keep the complaints of staying in one's own sandbox to a minimum
but anyways....
The following 2 statements seem to be directly contradicting each other... but there also appears to be a language issue. I dont think KenKim is a native english speaker based on some other posts, so

maybe that's at play here too...
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That doesn't make sense. But to get down to it.....
I agree. Every person is a selfish being. All of them without exception. Even those who are exceptionally altruistic are still selfish beings (and this was actually proven by a mathematician some time ago... although his name and publication are currently escaping me).
You don't do anything that doesn't suit you. You cut someone off in traffic? You have deemed that your few seconds spared is more valuable than that other person's. You volunteer by bathing in-patients in a hospice ward, you have decided that the feeling of reward you get is of greater value than the time and energy expended. You are forced at swordpoint to jump off of a plank into Davy Jones's locker? You have decided that practicing your dolphin swim technique is better than a sword to the kidney. Everything you do, you do so because you perceive a net benefit. Everything. Without exception. Period. It's time to outgrow the connotates of the word "selfish", guys
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This is false. There are plenty of things that are created for this purpose. Depending on how nebulous you want to get here, you could say that everything that is made is made for this purpose. If you're suggesting that things aren't made for the
sole purpose of changing someone's life I would agree. That pesky idea of personal gain (be it monetary, emotional, or anti-sword kidney sparing) applies here as well.
You can also be rewarded by hitting personal goals. You can be rewarded based on meaning you yourself apply to something (this is usually how people who volunteer receive their "reward"). I suppose personal recognition tends to be a sweeter reward for most people. But that doesn't mean that is all that is out there.
This is all kind of beside the point, however. The OP was asking about the "art" of dentistry vs the "science". This hasn't been well defined here... Some would argue that the bench work has plenty of science in it. There is technique involved, and therefore technical skill (as opposed to knowledge base). The reality is that the non-academic and non-cerebral aspects of schooling are a part of any healthcare profession. It's how we get paid. I'd get used to it.